Every human body begin as a single nucleated cell and this cell known as the ovum, vintage line drawing or engraving illustration. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/every-human-body-begin-as-a-single-nucleated-cell-and-this-cell-known-as-the-ovum-vintage-line-drawing-or-engraving-illustration-image348623893.html
RF2B75599–Every human body begin as a single nucleated cell and this cell known as the ovum, vintage line drawing or engraving illustration.
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RFR9BHAM–Process division of cell. Isolated on black background
Entitled: 'Simplico and Luicio Sodiria, Philippine twins. Twins are two offspring produced by the same pregnancy. Twins can either be monozygotic (identical), meaning that they can develop from just one zygote that will then split and form two embryos, or dizygotic (fraternal), meaning that they can develop from two different eggs, each are fertilized by separate sperm cells. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/entitled-simplico-and-luicio-sodiria-philippine-twins-twins-are-two-offspring-produced-by-the-same-pregnancy-twins-can-either-be-monozygotic-identical-meaning-that-they-can-develop-from-just-one-zygote-that-will-then-split-and-form-two-embryos-or-dizygotic-fraternal-meaning-that-they-can-develop-from-two-different-eggs-each-are-fertilized-by-separate-sperm-cells-image246588590.html
RMT9527A–Entitled: 'Simplico and Luicio Sodiria, Philippine twins. Twins are two offspring produced by the same pregnancy. Twins can either be monozygotic (identical), meaning that they can develop from just one zygote that will then split and form two embryos, or dizygotic (fraternal), meaning that they can develop from two different eggs, each are fertilized by separate sperm cells.
3d rendered illustration of human cells Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-image-3d-rendered-illustration-of-human-cells-162471195.html
RFKC95JK–3d rendered illustration of human cells
Glowing cell mitosis fractal, computer generated abstract background, black and white, 3d rendering Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/glowing-cell-mitosis-fractal-computer-generated-abstract-background-black-and-white-3d-rendering-image222472160.html
RFPWXDE8–Glowing cell mitosis fractal, computer generated abstract background, black and white, 3d rendering
Cell division stages, embryos, embryogenesis line icon. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/cell-division-stages-embryos-embryogenesis-line-icon-image249224270.html
RFTDD42P–Cell division stages, embryos, embryogenesis line icon.
Embryology icons collection is a vector illustration with editable stroke. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/embryology-icons-collection-is-a-vector-illustration-with-editable-stroke-image618914743.html
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egg and spoon Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/egg-and-spoon-image311852180.html
Simple graphic in black and white of hands holding a fetus, childbirth, obstetrician, abortion concept Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/simple-graphic-in-black-and-white-of-hands-holding-a-fetus-childbirth-obstetrician-abortion-concept-image596425809.html
RF2WJ9F5N–Simple graphic in black and white of hands holding a fetus, childbirth, obstetrician, abortion concept
Icon for impregnation,fecundation Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/icon-for-impregnationfecundation-image594297009.html
Human embryo, vintage engraved illustration. From the Universe and Humanity, 1910. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/human-embryo-vintage-engraved-illustration-from-the-universe-and-humanity-1910-image363179323.html
RF2C2T6X3–Human embryo, vintage engraved illustration. From the Universe and Humanity, 1910.
Ovum egg black glyph icon Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/ovum-egg-black-glyph-icon-image599091347.html
RF2WPJY3F–Ovum egg black glyph icon
Biology science icon. Uric acid, bacteria, cell, neuron, virus, DNA, reproduction and zygote symbol. Biology resources for teachers and students. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/biology-science-icon-uric-acid-bacteria-cell-neuron-virus-dna-reproduction-and-zygote-symbol-biology-resources-for-teachers-and-students-image558685018.html
RF2RCX8CA–Biology science icon. Uric acid, bacteria, cell, neuron, virus, DNA, reproduction and zygote symbol. Biology resources for teachers and students.
TEM of Zygote Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/stock-photo-tem-of-zygote-134944261.html
RMHRF6NW–TEM of Zygote
Division of human cells, embryonic development grey icon. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/division-of-human-cells-embryonic-development-grey-icon-image438207903.html
RF2GCX2J7–Division of human cells, embryonic development grey icon.
Form of the embryo which an embryo develops from a zygote, vintage line drawing or engraving illustration. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/form-of-the-embryo-which-an-embryo-develops-from-a-zygote-vintage-line-drawing-or-engraving-illustration-image348604309.html
RF2B7489W–Form of the embryo which an embryo develops from a zygote, vintage line drawing or engraving illustration.
line biology genetic embryo cells division Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/line-biology-genetic-embryo-cells-division-image152279819.html
An illustration of the division of a zygote of Cyclospora Cayetanensis into two sporoblasts, vintage line drawing or engraving illustration. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/an-illustration-of-the-division-of-a-zygote-of-cyclospora-cayetanensis-into-two-sporoblasts-vintage-line-drawing-or-engraving-illustration-image244608295.html
RFT5XTAF–An illustration of the division of a zygote of Cyclospora Cayetanensis into two sporoblasts, vintage line drawing or engraving illustration.
Division of human cells, embryonic development line icon. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/division-of-human-cells-embryonic-development-line-icon-image241243362.html
RFT0DGAA–Division of human cells, embryonic development line icon.
3d rendering metal cubes in shape of symbol of egg silhouette light silver colored on dark cubes with randomness Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/3d-rendering-metal-cubes-in-shape-of-symbol-of-egg-silhouette-light-silver-colored-on-dark-cubes-with-randomness-image435081988.html
RF2G7RKEC–3d rendering metal cubes in shape of symbol of egg silhouette light silver colored on dark cubes with randomness
Fertilization - vector line design single isolated icon on white background. High quality black pictogram. Sperm penetrates the egg. Conceiving a chil Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/fertilization-vector-line-design-single-isolated-icon-on-white-background-high-quality-black-pictogram-sperm-penetrates-the-egg-conceiving-a-chil-image450902296.html
RF2H5GADC–Fertilization - vector line design single isolated icon on white background. High quality black pictogram. Sperm penetrates the egg. Conceiving a chil
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RMAK4K10–symbolic image fertilization in the test tube
Icon for impregnation,fecundation Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/icon-for-impregnationfecundation-image591958923.html
RF2WB21J3–Icon for impregnation,fecundation
Line art icon of an egg cell depicting the biological structure of a human ovum for the process of fertilization Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/line-art-icon-of-an-egg-cell-depicting-the-biological-structure-of-a-human-ovum-for-the-process-of-fertilization-image611913708.html
RF2XFF250–Line art icon of an egg cell depicting the biological structure of a human ovum for the process of fertilization
Outlines of zoology . Fig. %%.—Polystomella, microspheric form, with smallcentral chamber {c.c), numerous nuclei (N), bridges ofprotoplasm between chambers (5).—After Lister. 94 PHYLUM PROTOZOA THE SIMPLEST ANIMALS. into the water, leaving behind them the empty test, andthere conjugate in pairs, not with one another but withsimilar gametes from another megalospheric individual.The zygote so formed becomes .the initial chamber ofa microspheric individual. In a more direct way—byfission — the megalospheric individual may give rise toanother like itself. There is therefore in this complex lifehis Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/outlines-of-zoology-fig-polystomella-microspheric-form-with-smallcentral-chamber-cc-numerous-nuclei-n-bridges-ofprotoplasm-between-chambers-5after-lister-94-phylum-protozoa-the-simplest-animals-into-the-water-leaving-behind-them-the-empty-test-andthere-conjugate-in-pairs-not-with-one-another-but-withsimilar-gametes-from-another-megalospheric-individualthe-zygote-so-formed-becomes-the-initial-chamber-ofa-microspheric-individual-in-a-more-direct-waybyfission-the-megalospheric-individual-may-give-rise-toanother-like-itself-there-is-therefore-in-this-complex-lifehis-image338083744.html
RM2AJ117C–Outlines of zoology . Fig. %%.—Polystomella, microspheric form, with smallcentral chamber {c.c), numerous nuclei (N), bridges ofprotoplasm between chambers (5).—After Lister. 94 PHYLUM PROTOZOA THE SIMPLEST ANIMALS. into the water, leaving behind them the empty test, andthere conjugate in pairs, not with one another but withsimilar gametes from another megalospheric individual.The zygote so formed becomes .the initial chamber ofa microspheric individual. In a more direct way—byfission — the megalospheric individual may give rise toanother like itself. There is therefore in this complex lifehis
Human embryo, vintage engraved illustration. From the Universe and Humanity, 1910. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/human-embryo-vintage-engraved-illustration-from-the-universe-and-humanity-1910-image363178579.html
RF2C2T5YF–Human embryo, vintage engraved illustration. From the Universe and Humanity, 1910.
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RF2WPJXJG–Genetic material freezing linear icons set for dark, light mode
Biology science icon. Uric acid, bacteria, cell, neuron, virus, DNA, reproduction and zygote symbol. Biology resources for teachers and students. Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/biology-science-icon-uric-acid-bacteria-cell-neuron-virus-dna-reproduction-and-zygote-symbol-biology-resources-for-teachers-and-students-image558686721.html
RF2RCXAH5–Biology science icon. Uric acid, bacteria, cell, neuron, virus, DNA, reproduction and zygote symbol. Biology resources for teachers and students.
. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. MENDEL'S LAWS OF HEREDITY 389 (segregates) the two chromosomes carrying the character for taUness, so that each gamete contains one. This occurs for the other characters as well as for that of tallness. From the tall plant, therefore, all the gametes will contain the character for tallness, and from a dwarf plant all of the gametes would contain the character for dwarfness. When these two individuals are crossed the zygote will contain both charac- ters, and these two characters will be transmitted together in the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/readings-in-evolution-genetics-and-eugenics-evolution-heredity-eugenics-mendels-laws-of-heredity-389-segregates-the-two-chromosomes-carrying-the-character-for-tauness-so-that-each-gamete-contains-one-this-occurs-for-the-other-characters-as-well-as-for-that-of-tallness-from-the-tall-plant-therefore-all-the-gametes-will-contain-the-character-for-tallness-and-from-a-dwarf-plant-all-of-the-gametes-would-contain-the-character-for-dwarfness-when-these-two-individuals-are-crossed-the-zygote-will-contain-both-charac-ters-and-these-two-characters-will-be-transmitted-together-in-the-image216392391.html
RMPG1EKK–. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. MENDEL'S LAWS OF HEREDITY 389 (segregates) the two chromosomes carrying the character for taUness, so that each gamete contains one. This occurs for the other characters as well as for that of tallness. From the tall plant, therefore, all the gametes will contain the character for tallness, and from a dwarf plant all of the gametes would contain the character for dwarfness. When these two individuals are crossed the zygote will contain both charac- ters, and these two characters will be transmitted together in the
Line art icon of two human egg cells in the process of being fertilized Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/line-art-icon-of-two-human-egg-cells-in-the-process-of-being-fertilized-image611913775.html
RF2XFF27B–Line art icon of two human egg cells in the process of being fertilized
An introduction to the study of the comparative anatomy of animals . A. Fig- 32-A^ a free specimen of Monocystis a^Hs, nu, nucleus. 5, sperm-motber cells adhering to the parasite, i), a free monocystiscovered with ripe spermatozoa, and thus appearing as if coveredwith a coat of long cilia. C, a ripe cyst of Monocystis agiliscontainingnumerouspseudonavicellae/.rff. {A and .5, original;C, after Lankester.) is termed a zygote (Greek C^y^, a yoke, because the twoare yoked or joined together). The zygotes contract intospherical form, and each contributes to the formation of acommon transparent prot Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/an-introduction-to-the-study-of-the-comparative-anatomy-of-animals-a-fig-32-a-a-free-specimen-of-monocystis-ahs-nu-nucleus-5-sperm-motber-cells-adhering-to-the-parasite-i-a-free-monocystiscovered-with-ripe-spermatozoa-and-thus-appearing-as-if-coveredwith-a-coat-of-long-cilia-c-a-ripe-cyst-of-monocystis-agiliscontainingnumerouspseudonavicellaerff-a-and-5-originalc-after-lankester-is-termed-a-zygote-greek-cy-a-yoke-because-the-twoare-yoked-or-joined-together-the-zygotes-contract-intospherical-form-and-each-contributes-to-the-formation-of-acommon-transparent-prot-image342688862.html
RM2AWER3X–An introduction to the study of the comparative anatomy of animals . A. Fig- 32-A^ a free specimen of Monocystis a^Hs, nu, nucleus. 5, sperm-motber cells adhering to the parasite, i), a free monocystiscovered with ripe spermatozoa, and thus appearing as if coveredwith a coat of long cilia. C, a ripe cyst of Monocystis agiliscontainingnumerouspseudonavicellae/.rff. {A and .5, original;C, after Lankester.) is termed a zygote (Greek C^y^, a yoke, because the twoare yoked or joined together). The zygotes contract intospherical form, and each contributes to the formation of acommon transparent prot
Embryos of the pore. almost natural in size, vintage engraved illustration. From the Universe and Humanity, 1910. Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/embryos-of-the-pore-almost-natural-in-size-vintage-engraved-illustration-from-the-universe-and-humanity-1910-image363178580.html
RF2C2T5YG–Embryos of the pore. almost natural in size, vintage engraved illustration. From the Universe and Humanity, 1910.
Ovum egg white linear icon for dark theme Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/ovum-egg-white-linear-icon-for-dark-theme-image599091154.html
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. Plant genetics . Heredity; Mendel's law; Plant breeding. Fig. I.—Diagram illustrating Weisijann's theory of germinal continuity. Three generations are represented, with cells of germ plasm shaded, and those of body plasm Unshaded; germ plasm con- tinuous from generation to generation, carried over from parent to offspring by zygote (Z); impossible for body plasm to perpetuate itself into a second generation.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not per Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/plant-genetics-heredity-mendels-law-plant-breeding-fig-idiagram-illustrating-weisijanns-theory-of-germinal-continuity-three-generations-are-represented-with-cells-of-germ-plasm-shaded-and-those-of-body-plasm-unshaded-germ-plasm-con-tinuous-from-generation-to-generation-carried-over-from-parent-to-offspring-by-zygote-z-impossible-for-body-plasm-to-perpetuate-itself-into-a-second-generation-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-per-image216450875.html
RMPG458B–. Plant genetics . Heredity; Mendel's law; Plant breeding. Fig. I.—Diagram illustrating Weisijann's theory of germinal continuity. Three generations are represented, with cells of germ plasm shaded, and those of body plasm Unshaded; germ plasm con- tinuous from generation to generation, carried over from parent to offspring by zygote (Z); impossible for body plasm to perpetuate itself into a second generation.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not per
This icon represents the process of artificial insemination, where sperm is injected into an egg cell Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/this-icon-represents-the-process-of-artificial-insemination-where-sperm-is-injected-into-an-egg-cell-image620196237.html
RF2Y10AHH–This icon represents the process of artificial insemination, where sperm is injected into an egg cell
Outlines of zoology . Fig. 37.—Polystomella, megalo-spheric form, with large centralchamber (M) and one nucleus(iV).—After Lister. hosts of tiny cells are e provided with flagella, swim out. Fig. %%.—Polystomella, microspheric form, with smallcentral chamber {c.c), numerous nuclei (N), bridges ofprotoplasm between chambers (5).—After Lister. 94 PHYLUM PROTOZOA THE SIMPLEST ANIMALS. into the water, leaving behind them the empty test, andthere conjugate in pairs, not with one another but withsimilar gametes from another megalospheric individual.The zygote so formed becomes .the initial chamber o Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/outlines-of-zoology-fig-37polystomella-megalo-spheric-form-with-large-centralchamber-m-and-one-nucleusivafter-lister-hosts-of-tiny-cells-are-e-provided-with-flagella-swim-out-fig-polystomella-microspheric-form-with-smallcentral-chamber-cc-numerous-nuclei-n-bridges-ofprotoplasm-between-chambers-5after-lister-94-phylum-protozoa-the-simplest-animals-into-the-water-leaving-behind-them-the-empty-test-andthere-conjugate-in-pairs-not-with-one-another-but-withsimilar-gametes-from-another-megalospheric-individualthe-zygote-so-formed-becomes-the-initial-chamber-o-image338084518.html
RM2AJ1272–Outlines of zoology . Fig. 37.—Polystomella, megalo-spheric form, with large centralchamber (M) and one nucleus(iV).—After Lister. hosts of tiny cells are e provided with flagella, swim out. Fig. %%.—Polystomella, microspheric form, with smallcentral chamber {c.c), numerous nuclei (N), bridges ofprotoplasm between chambers (5).—After Lister. 94 PHYLUM PROTOZOA THE SIMPLEST ANIMALS. into the water, leaving behind them the empty test, andthere conjugate in pairs, not with one another but withsimilar gametes from another megalospheric individual.The zygote so formed becomes .the initial chamber o
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. The biology of twins (mammals) . Twins. i6o THE BIOLOGY OF TWINS of as a lack of correspondence with the rest." Yet no well-defined idea of the significance of these reversals seems to have occurred to Wilder. Bateson, however, sees in these pecuUar phenomena evidence that twins derived from a single X y zygote have been parts of a single system of symmetry. This is evidently the key to the significance of symmetry reversals, as was brought out in the discussion of symmetry reversals of armadillo quadruplets. As Wilder has pointed out so clearly in his latest paper ("Palm and Sole Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-biology-of-twins-mammals-twins-i6o-the-biology-of-twins-of-as-a-lack-of-correspondence-with-the-restquot-yet-no-well-defined-idea-of-the-significance-of-these-reversals-seems-to-have-occurred-to-wilder-bateson-however-sees-in-these-pecuuar-phenomena-evidence-that-twins-derived-from-a-single-x-y-zygote-have-been-parts-of-a-single-system-of-symmetry-this-is-evidently-the-key-to-the-significance-of-symmetry-reversals-as-was-brought-out-in-the-discussion-of-symmetry-reversals-of-armadillo-quadruplets-as-wilder-has-pointed-out-so-clearly-in-his-latest-paper-quotpalm-and-sole-image216444073.html
RMPG3THD–. The biology of twins (mammals) . Twins. i6o THE BIOLOGY OF TWINS of as a lack of correspondence with the rest." Yet no well-defined idea of the significance of these reversals seems to have occurred to Wilder. Bateson, however, sees in these pecuUar phenomena evidence that twins derived from a single X y zygote have been parts of a single system of symmetry. This is evidently the key to the significance of symmetry reversals, as was brought out in the discussion of symmetry reversals of armadillo quadruplets. As Wilder has pointed out so clearly in his latest paper ("Palm and Sole
Black and white icon of a syringe injecting substance into a petri dish containing two oocytes, representing the in vitro fertilization process Stock Vectorhttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/black-and-white-icon-of-a-syringe-injecting-substance-into-a-petri-dish-containing-two-oocytes-representing-the-in-vitro-fertilization-process-image614895453.html
RF2XMAWBW–Black and white icon of a syringe injecting substance into a petri dish containing two oocytes, representing the in vitro fertilization process
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. loo.—Schema showing the human and mosquito cycles of themalarial parasite: A, Normal red cell; B, C, D, E, red cells containingamebulas or myxopods; F, G, H, sporocytes; J, K, L, M, microgame-tocytes or male gametes; J, K, L, M, O, macrogametocytes, orfemale gametes; N, M, microgametes; P, traveling vermicule; Q,young zygote; R, S, zygotomeres; T, blastophore; U, mature zygote(modified from Blanchards diagram illustrating life-cycle of Coccidiumschubergi) (Rees, in Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/essentials-of-bacteriology-being-a-concise-and-systematic-introduction-to-the-study-of-bacteria-and-allied-microorganisms-fig-looschema-showing-the-human-and-mosquito-cycles-of-themalarial-parasite-a-normal-red-cell-b-c-d-e-red-cells-containingamebulas-or-myxopods-f-g-h-sporocytes-j-k-l-m-microgame-tocytes-or-male-gametes-j-k-l-m-o-macrogametocytes-orfemale-gametes-n-m-microgametes-p-traveling-vermicule-qyoung-zygote-r-s-zygotomeres-t-blastophore-u-mature-zygotemodified-from-blanchards-diagram-illustrating-life-cycle-of-coccidiumschubergi-rees-in-image342908626.html
RM2AWTRCJ–Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . Fig. loo.—Schema showing the human and mosquito cycles of themalarial parasite: A, Normal red cell; B, C, D, E, red cells containingamebulas or myxopods; F, G, H, sporocytes; J, K, L, M, microgame-tocytes or male gametes; J, K, L, M, O, macrogametocytes, orfemale gametes; N, M, microgametes; P, traveling vermicule; Q,young zygote; R, S, zygotomeres; T, blastophore; U, mature zygote(modified from Blanchards diagram illustrating life-cycle of Coccidiumschubergi) (Rees, in
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. Plant genetics . Heredity; Mendel's law; Plant breeding. SPOROPHYTE INDIVIDUAL 8 CHROMOSOMES CAMETOPHYTE INDIVIDUAL 4 CHROMOSOMES ZYGOTE 8 CHROMOSOMES I FERTILIZATION I v-i. Fig. 28.—Diagram representing life-history of a higher plant as regards chromosome number. by fig. 29. When the reduction division occurs it means that 4 of these chromosomes will go to each of the two resulting nuclei. When this happens, are the chromosomes chosen indiscriminately? It has been learned that there is a certain limitation in the choice,. Please note that these images are extracted from scanned page images Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/plant-genetics-heredity-mendels-law-plant-breeding-sporophyte-individual-8-chromosomes-cametophyte-individual-4-chromosomes-zygote-8-chromosomes-i-fertilization-i-v-i-fig-28diagram-representing-life-history-of-a-higher-plant-as-regards-chromosome-number-by-fig-29-when-the-reduction-division-occurs-it-means-that-4-of-these-chromosomes-will-go-to-each-of-the-two-resulting-nuclei-when-this-happens-are-the-chromosomes-chosen-indiscriminately-it-has-been-learned-that-there-is-a-certain-limitation-in-the-choice-please-note-that-these-images-are-extracted-from-scanned-page-images-image216449901.html
RMPG441H–. Plant genetics . Heredity; Mendel's law; Plant breeding. SPOROPHYTE INDIVIDUAL 8 CHROMOSOMES CAMETOPHYTE INDIVIDUAL 4 CHROMOSOMES ZYGOTE 8 CHROMOSOMES I FERTILIZATION I v-i. Fig. 28.—Diagram representing life-history of a higher plant as regards chromosome number. by fig. 29. When the reduction division occurs it means that 4 of these chromosomes will go to each of the two resulting nuclei. When this happens, are the chromosomes chosen indiscriminately? It has been learned that there is a certain limitation in the choice,. Please note that these images are extracted from scanned page images
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. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . le is similar in all species of the parasite. The flagellation of the male parasite described above will promptlytake place in the stomach of the anopheles, 4 to 8 microgametes beingformed; these conjugate with the female element (Plate VII) in amanner comparable to the impregnation of the ovum of higher animalsby spermatozoids. The macrogametocyte becomes a macrogameteby the formation of a reduction nucleus which is thrown out of theorganism. The product of conjugation, the ookinet (zygote), remai Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/pathogenic-microorganisms-a-practical-manual-for-students-physicians-and-health-officers-le-is-similar-in-all-species-of-the-parasite-the-flagellation-of-the-male-parasite-described-above-will-promptlytake-place-in-the-stomach-of-the-anopheles-4-to-8-microgametes-beingformed-these-conjugate-with-the-female-element-plate-vii-in-amanner-comparable-to-the-impregnation-of-the-ovum-of-higher-animalsby-spermatozoids-the-macrogametocyte-becomes-a-macrogameteby-the-formation-of-a-reduction-nucleus-which-is-thrown-out-of-theorganism-the-product-of-conjugation-the-ookinet-zygote-remai-image370123634.html
RM2CE4GD6–. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . le is similar in all species of the parasite. The flagellation of the male parasite described above will promptlytake place in the stomach of the anopheles, 4 to 8 microgametes beingformed; these conjugate with the female element (Plate VII) in amanner comparable to the impregnation of the ovum of higher animalsby spermatozoids. The macrogametocyte becomes a macrogameteby the formation of a reduction nucleus which is thrown out of theorganism. The product of conjugation, the ookinet (zygote), remai
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. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. THE PHYSICAL BASIS OF MENDELISM 409 and the other from the male with the chromosomes in full black, unite to form the female zygote shown in the middle of the figure. The combinations of maternal and paternal chromosomes which result in the production of germ cells in such an individual are shown diagram-. U m m m M f( )T( JiK. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectl Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/readings-in-evolution-genetics-and-eugenics-evolution-heredity-eugenics-the-physical-basis-of-mendelism-409-and-the-other-from-the-male-with-the-chromosomes-in-full-black-unite-to-form-the-female-zygote-shown-in-the-middle-of-the-figure-the-combinations-of-maternal-and-paternal-chromosomes-which-result-in-the-production-of-germ-cells-in-such-an-individual-are-shown-diagram-u-m-m-m-m-f-t-jik-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectl-image216392334.html
RMPG1EHJ–. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. THE PHYSICAL BASIS OF MENDELISM 409 and the other from the male with the chromosomes in full black, unite to form the female zygote shown in the middle of the figure. The combinations of maternal and paternal chromosomes which result in the production of germ cells in such an individual are shown diagram-. U m m m M f( )T( JiK. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectl
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. Pharmaceutical bacteriology. Bacteriology; Disinfection and disinfectants. 126 PHARMACEUTICAL BACTERIOLOGY reduced to a minimum (a, b, c, d). In the gametic union these properties would be combined in the zygote, at least we can assume that such might be the case. In the cell septations which would result from this zygotfe the properties (inherited) of the two gametes might appear in the daughter cells in sixteen possible combinations and it is readily comprehensible how and why some of the combinations would be more suitably adapted to the environment than others and these would secure the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/pharmaceutical-bacteriology-bacteriology-disinfection-and-disinfectants-126-pharmaceutical-bacteriology-reduced-to-a-minimum-a-b-c-d-in-the-gametic-union-these-properties-would-be-combined-in-the-zygote-at-least-we-can-assume-that-such-might-be-the-case-in-the-cell-septations-which-would-result-from-this-zygotfe-the-properties-inherited-of-the-two-gametes-might-appear-in-the-daughter-cells-in-sixteen-possible-combinations-and-it-is-readily-comprehensible-how-and-why-some-of-the-combinations-would-be-more-suitably-adapted-to-the-environment-than-others-and-these-would-secure-the-image232443608.html
RMRE4M5C–. Pharmaceutical bacteriology. Bacteriology; Disinfection and disinfectants. 126 PHARMACEUTICAL BACTERIOLOGY reduced to a minimum (a, b, c, d). In the gametic union these properties would be combined in the zygote, at least we can assume that such might be the case. In the cell septations which would result from this zygotfe the properties (inherited) of the two gametes might appear in the daughter cells in sixteen possible combinations and it is readily comprehensible how and why some of the combinations would be more suitably adapted to the environment than others and these would secure the
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. Plant genetics . Heredity; Mendel's law; Plant breeding. Mendel's Law 35 In fig. 4 one zygote receives a double dose of tallness and two others a single dose. These phrases are more or less common in the Uterature of the subject, but the more frequent terminology is as follows. When two similar gametes unite to form a zygote it is called a homo- zygote; when the two pairing gametes are different the zygote is called a heterozygote. Using this terminology. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration an Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/plant-genetics-heredity-mendels-law-plant-breeding-mendels-law-35-in-fig-4-one-zygote-receives-a-double-dose-of-tallness-and-two-others-a-single-dose-these-phrases-are-more-or-less-common-in-the-uterature-of-the-subject-but-the-more-frequent-terminology-is-as-follows-when-two-similar-gametes-unite-to-form-a-zygote-it-is-called-a-homo-zygote-when-the-two-pairing-gametes-are-different-the-zygote-is-called-a-heterozygote-using-this-terminology-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-an-image216450751.html
RMPG453Y–. Plant genetics . Heredity; Mendel's law; Plant breeding. Mendel's Law 35 In fig. 4 one zygote receives a double dose of tallness and two others a single dose. These phrases are more or less common in the Uterature of the subject, but the more frequent terminology is as follows. When two similar gametes unite to form a zygote it is called a homo- zygote; when the two pairing gametes are different the zygote is called a heterozygote. Using this terminology. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration an
. The Cambridge natural history. Zoology. Ill foraminifp:ra 6g only exogamously} The fusion of their nuclei takes place after some delay: ultimately the zygote nucleus divides into two, a shell is formed, and we have the microsphere, which is thus pluri-nucleate ab initio. As we have seen, the nuclei of the microsphere are ultimately replaced by chromidia, and the whole plasmic body divides into pseudopodiospores, which grow into the megalospheric form. In the Perforate genera, Fatellina and Discorbina, plastogamy precedes brood formation, the cytoplasms of the 2-5 pairing individuals contract Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-cambridge-natural-history-zoology-ill-foraminifpra-6g-only-exogamously-the-fusion-of-their-nuclei-takes-place-after-some-delay-ultimately-the-zygote-nucleus-divides-into-two-a-shell-is-formed-and-we-have-the-microsphere-which-is-thus-pluri-nucleate-ab-initio-as-we-have-seen-the-nuclei-of-the-microsphere-are-ultimately-replaced-by-chromidia-and-the-whole-plasmic-body-divides-into-pseudopodiospores-which-grow-into-the-megalospheric-form-in-the-perforate-genera-fatellina-and-discorbina-plastogamy-precedes-brood-formation-the-cytoplasms-of-the-2-5-pairing-individuals-contract-image232163793.html
RMRDKY81–. The Cambridge natural history. Zoology. Ill foraminifp:ra 6g only exogamously} The fusion of their nuclei takes place after some delay: ultimately the zygote nucleus divides into two, a shell is formed, and we have the microsphere, which is thus pluri-nucleate ab initio. As we have seen, the nuclei of the microsphere are ultimately replaced by chromidia, and the whole plasmic body divides into pseudopodiospores, which grow into the megalospheric form. In the Perforate genera, Fatellina and Discorbina, plastogamy precedes brood formation, the cytoplasms of the 2-5 pairing individuals contract
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. Plant studies; an elementary botany. Botany. 238 PLANT STUDIES is the low type called isogamy, the pairing gametes being alike. TJlothrix is taken as a representative of the Conferva forms, the most characteristic group of Chlorophyceaj. All. Pig. 205 Tlnlliin rnnfi ril fiiinl. ,l,l),is, hegiuning of new lilanutd from zoospore; E. feeble lilanienis formed b.y the small zoospores; F, zygole growing after rest; (?, zoospores jirodaced by zygote.—C'ALPwyLL, excciit F and r/. which are after DODEL-PORT. the Conferva forms, however, are not isogamous, as will he illnatrated by tlie next example Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/plant-studies-an-elementary-botany-botany-238-plant-studies-is-the-low-type-called-isogamy-the-pairing-gametes-being-alike-tjlothrix-is-taken-as-a-representative-of-the-conferva-forms-the-most-characteristic-group-of-chlorophyceaj-all-pig-205-tlnlliin-rnnfi-ril-fiiinl-llis-hegiuning-of-new-lilanutd-from-zoospore-e-feeble-lilanienis-formed-by-the-small-zoospores-f-zygole-growing-after-rest-zoospores-jirodaced-by-zygotecalpwyll-excciit-f-and-r-which-are-after-dodel-port-the-conferva-forms-however-are-not-isogamous-as-will-he-illnatrated-by-tlie-next-example-image216435226.html
RMPG3D9E–. Plant studies; an elementary botany. Botany. 238 PLANT STUDIES is the low type called isogamy, the pairing gametes being alike. TJlothrix is taken as a representative of the Conferva forms, the most characteristic group of Chlorophyceaj. All. Pig. 205 Tlnlliin rnnfi ril fiiinl. ,l,l),is, hegiuning of new lilanutd from zoospore; E. feeble lilanienis formed b.y the small zoospores; F, zygole growing after rest; (?, zoospores jirodaced by zygote.—C'ALPwyLL, excciit F and r/. which are after DODEL-PORT. the Conferva forms, however, are not isogamous, as will he illnatrated by tlie next example
. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. MENDEL'S LAWS OF HEREDITY 389 (segregates) the two chromosomes carrying the character for taUness, so that each gamete contains one. This occurs for the other characters as well as for that of tallness. From the tall plant, therefore, all the gametes will contain the character for tallness, and from a dwarf plant all of the gametes would contain the character for dwarfness. When these two individuals are crossed the zygote will contain both charac- ters, and these two characters will be transmitted together in the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/readings-in-evolution-genetics-and-eugenics-evolution-heredity-eugenics-mendels-laws-of-heredity-389-segregates-the-two-chromosomes-carrying-the-character-for-tauness-so-that-each-gamete-contains-one-this-occurs-for-the-other-characters-as-well-as-for-that-of-tallness-from-the-tall-plant-therefore-all-the-gametes-will-contain-the-character-for-tallness-and-from-a-dwarf-plant-all-of-the-gametes-would-contain-the-character-for-dwarfness-when-these-two-individuals-are-crossed-the-zygote-will-contain-both-charac-ters-and-these-two-characters-will-be-transmitted-together-in-the-image231999651.html
RMRDCDWR–. Readings in evolution, genetics, and eugenics. Evolution; Heredity; Eugenics. MENDEL'S LAWS OF HEREDITY 389 (segregates) the two chromosomes carrying the character for taUness, so that each gamete contains one. This occurs for the other characters as well as for that of tallness. From the tall plant, therefore, all the gametes will contain the character for tallness, and from a dwarf plant all of the gametes would contain the character for dwarfness. When these two individuals are crossed the zygote will contain both charac- ters, and these two characters will be transmitted together in the
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. Plant genetics . Heredity; Mendel's law; Plant breeding. Inheritance in Gametophytes 125 superficial result but the process. The process may be recalled for a moment. Suppose that each of the 8 chromosomes in a spore mother-cell contains a single determiner; in such a case a nucleus can be represented SPORE MOTHER-CELL 8 CHROMOSOMES lREDUCnON( I DIVISION !. SPOROPHYTE INDIVIDUAL 8 CHROMOSOMES CAMETOPHYTE INDIVIDUAL 4 CHROMOSOMES ZYGOTE 8 CHROMOSOMES I FERTILIZATION I v-i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabilit Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/plant-genetics-heredity-mendels-law-plant-breeding-inheritance-in-gametophytes-125-superficial-result-but-the-process-the-process-may-be-recalled-for-a-moment-suppose-that-each-of-the-8-chromosomes-in-a-spore-mother-cell-contains-a-single-determiner-in-such-a-case-a-nucleus-can-be-represented-spore-mother-cell-8-chromosomes-lreducnon-i-division-!-sporophyte-individual-8-chromosomes-cametophyte-individual-4-chromosomes-zygote-8-chromosomes-i-fertilization-i-v-i-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readabilit-image216449846.html
RMPG43YJ–. Plant genetics . Heredity; Mendel's law; Plant breeding. Inheritance in Gametophytes 125 superficial result but the process. The process may be recalled for a moment. Suppose that each of the 8 chromosomes in a spore mother-cell contains a single determiner; in such a case a nucleus can be represented SPORE MOTHER-CELL 8 CHROMOSOMES lREDUCnON( I DIVISION !. SPOROPHYTE INDIVIDUAL 8 CHROMOSOMES CAMETOPHYTE INDIVIDUAL 4 CHROMOSOMES ZYGOTE 8 CHROMOSOMES I FERTILIZATION I v-i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabilit
. Elements of plant biology. Plant physiology. DIFFERENTIATION OF GAMETES 211 in some species, for instance the cells forming male gametes are sometimes shorter than those forming the. Fig. 32.—A and B, two stages of development of the zygote of a species of Spirogyra in which the wall is transparent and the chloroplast of the male gamete is degenerating and breaking up. The chloroplast of the female gamete alone produces the chloroplasts of the cells of the new Individual, x 800 (after Chmielevsky). C, germination of zygote : two cells of the new individual are produced, x 395. females, and i Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/elements-of-plant-biology-plant-physiology-differentiation-of-gametes-211-in-some-species-for-instance-the-cells-forming-male-gametes-are-sometimes-shorter-than-those-forming-the-fig-32a-and-b-two-stages-of-development-of-the-zygote-of-a-species-of-spirogyra-in-which-the-wall-is-transparent-and-the-chloroplast-of-the-male-gamete-is-degenerating-and-breaking-up-the-chloroplast-of-the-female-gamete-alone-produces-the-chloroplasts-of-the-cells-of-the-new-individual-x-800-after-chmielevsky-c-germination-of-zygote-two-cells-of-the-new-individual-are-produced-x-395-females-and-i-image232115641.html
RMRDHNT9–. Elements of plant biology. Plant physiology. DIFFERENTIATION OF GAMETES 211 in some species, for instance the cells forming male gametes are sometimes shorter than those forming the. Fig. 32.—A and B, two stages of development of the zygote of a species of Spirogyra in which the wall is transparent and the chloroplast of the male gamete is degenerating and breaking up. The chloroplast of the female gamete alone produces the chloroplasts of the cells of the new Individual, x 800 (after Chmielevsky). C, germination of zygote : two cells of the new individual are produced, x 395. females, and i
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. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. EMBRYOLOGY 469 peculiarities he describes as other than. extreme modifications along the lines already indicated by the less specialised embryos of the family.1 The first detailed description of the embryo in any of the species of Botrychium was given by Jeffrey for B. virginianum, and it has been verified in many points by Campbell. The very large prothallus bears its archegonia on the upper surface :. after fertilisation the zygote enlarges, and divides first vertically to the axis of the archegoniu Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-origin-of-a-land-flora-a-theory-based-upon-the-facts-of-alternation-plant-morphology-embryology-469-peculiarities-he-describes-as-other-than-extreme-modifications-along-the-lines-already-indicated-by-the-less-specialised-embryos-of-the-family1-the-first-detailed-description-of-the-embryo-in-any-of-the-species-of-botrychium-was-given-by-jeffrey-for-b-virginianum-and-it-has-been-verified-in-many-points-by-campbell-the-very-large-prothallus-bears-its-archegonia-on-the-upper-surface-after-fertilisation-the-zygote-enlarges-and-divides-first-vertically-to-the-axis-of-the-archegoniu-image232308071.html
RMRDXF8R–. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. EMBRYOLOGY 469 peculiarities he describes as other than. extreme modifications along the lines already indicated by the less specialised embryos of the family.1 The first detailed description of the embryo in any of the species of Botrychium was given by Jeffrey for B. virginianum, and it has been verified in many points by Campbell. The very large prothallus bears its archegonia on the upper surface :. after fertilisation the zygote enlarges, and divides first vertically to the axis of the archegoniu
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. A manual of zoology. Zoology. Fig. 140. Fig. 141. Fig. 142. Fig. 140.—Lamblia inlesiinalis (aitei Giassi). Front and side views, h, nucleus. Fig. 141.—Trichomonas batrachoriim (after Dobell). ax, axial rod; cs, cytostome; b, blepharoplast; m, undulating membrane; n, nucleus. Fig. 142.—SpirochcEta pallida (after Schaudinn). become macrogametes and others form eight microgametes. Macro- and microgametes unite in the intestine of the mosquito, Culex pipiens, to a zygote (ookinete), which grows to a large multinucleate body (fig. 139, a-c). From this, together with the formation of a residual bo Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-140-fig-141-fig-142-fig-140lamblia-inlesiinalis-aitei-giassi-front-and-side-views-h-nucleus-fig-141trichomonas-batrachoriim-after-dobell-ax-axial-rod-cs-cytostome-b-blepharoplast-m-undulating-membrane-n-nucleus-fig-142spirochceta-pallida-after-schaudinn-become-macrogametes-and-others-form-eight-microgametes-macro-and-microgametes-unite-in-the-intestine-of-the-mosquito-culex-pipiens-to-a-zygote-ookinete-which-grows-to-a-large-multinucleate-body-fig-139-a-c-from-this-together-with-the-formation-of-a-residual-bo-image216442473.html
RMPG3PG9–. A manual of zoology. Zoology. Fig. 140. Fig. 141. Fig. 142. Fig. 140.—Lamblia inlesiinalis (aitei Giassi). Front and side views, h, nucleus. Fig. 141.—Trichomonas batrachoriim (after Dobell). ax, axial rod; cs, cytostome; b, blepharoplast; m, undulating membrane; n, nucleus. Fig. 142.—SpirochcEta pallida (after Schaudinn). become macrogametes and others form eight microgametes. Macro- and microgametes unite in the intestine of the mosquito, Culex pipiens, to a zygote (ookinete), which grows to a large multinucleate body (fig. 139, a-c). From this, together with the formation of a residual bo
. Text-book of embryology. Embryology. 14 EMBRYOLOGY OF THE LOWER VEETEBRATES oh. that the first latitudinal furrow cannot be identified in the Elasmo- branch and further that the study of sections shows that the furrows sometimes cut into the germinal disc obliquely instead of being perpendicular to the egg surface. The nuclei of the blastoderm divide synchronously and after four divisions have taken place, when there are sixteen nuclei in place of the original single zygote nucleus, the segmentation furrows (Fig. 8, C) form a network dividing up the blastoderm into smaller central and larger Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/text-book-of-embryology-embryology-14-embryology-of-the-lower-veetebrates-oh-that-the-first-latitudinal-furrow-cannot-be-identified-in-the-elasmo-branch-and-further-that-the-study-of-sections-shows-that-the-furrows-sometimes-cut-into-the-germinal-disc-obliquely-instead-of-being-perpendicular-to-the-egg-surface-the-nuclei-of-the-blastoderm-divide-synchronously-and-after-four-divisions-have-taken-place-when-there-are-sixteen-nuclei-in-place-of-the-original-single-zygote-nucleus-the-segmentation-furrows-fig-8-c-form-a-network-dividing-up-the-blastoderm-into-smaller-central-and-larger-image232128528.html
RMRDJA8G–. Text-book of embryology. Embryology. 14 EMBRYOLOGY OF THE LOWER VEETEBRATES oh. that the first latitudinal furrow cannot be identified in the Elasmo- branch and further that the study of sections shows that the furrows sometimes cut into the germinal disc obliquely instead of being perpendicular to the egg surface. The nuclei of the blastoderm divide synchronously and after four divisions have taken place, when there are sixteen nuclei in place of the original single zygote nucleus, the segmentation furrows (Fig. 8, C) form a network dividing up the blastoderm into smaller central and larger
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. A manual of zoology. Zoology. 111. SPOROZOA: HiEMOSPHORIDA 189. Fig. 146.â1-7. Develupmentof Coccidium schuhetgi (afterSthaudinn). i, entrance of sporozoites in cell; 2, its growth: 3, nuclear multiplication; 4, division into mero- zoites; 5, macro- and microgametes; 5, zygote diided into four sporozoites. 8-11, Emeria stieda: (after Wasiele«sky und Metzner). 8, autoinfection (progamic increase); 9, formation of sporobLists, 10, change of spores into sporozoites; 11, spore "with t^^â o sporozoites, more enlarged; c, s, sporozoite; e, epithelial cell; k, n, nucleus; nn, micro- gamete; Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-111-sporozoa-hiemosphorida-189-fig-1461-7-develupmentof-coccidium-schuhetgi-aftersthaudinn-i-entrance-of-sporozoites-in-cell-2-its-growth-3-nuclear-multiplication-4-division-into-mero-zoites-5-macro-and-microgametes-5-zygote-diided-into-four-sporozoites-8-11-emeria-stieda-after-wasielesky-und-metzner-8-autoinfection-progamic-increase-9-formation-of-sporoblists-10-change-of-spores-into-sporozoites-11-spore-quotwith-t-o-sporozoites-more-enlarged-c-s-sporozoite-e-epithelial-cell-k-n-nucleus-nn-micro-gamete-image216442450.html
RMPG3PFE–. A manual of zoology. Zoology. 111. SPOROZOA: HiEMOSPHORIDA 189. Fig. 146.â1-7. Develupmentof Coccidium schuhetgi (afterSthaudinn). i, entrance of sporozoites in cell; 2, its growth: 3, nuclear multiplication; 4, division into mero- zoites; 5, macro- and microgametes; 5, zygote diided into four sporozoites. 8-11, Emeria stieda: (after Wasiele«sky und Metzner). 8, autoinfection (progamic increase); 9, formation of sporobLists, 10, change of spores into sporozoites; 11, spore "with t^^â o sporozoites, more enlarged; c, s, sporozoite; e, epithelial cell; k, n, nucleus; nn, micro- gamete;
. Botany of the living plant. Botany. MUSCI AND HEPATICAE 369 out. In any organism with a life-cycle punctuated by the two stages of the spore and the zygote, there are two possibilities of somatic expan- sion, viz. in the diploid sporophyte and in the haploid gametophyte. In the Bryophytes the second alternative has been fully exploited. Their characters depend upon the de'elopment of the gametophyte to the highest condition in which it is seen in Land Vegetation. The details of this development run parallel with those of the sporophyte in Vascular Plants, so that the two present a series of Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/botany-of-the-living-plant-botany-musci-and-hepaticae-369-out-in-any-organism-with-a-life-cycle-punctuated-by-the-two-stages-of-the-spore-and-the-zygote-there-are-two-possibilities-of-somatic-expan-sion-viz-in-the-diploid-sporophyte-and-in-the-haploid-gametophyte-in-the-bryophytes-the-second-alternative-has-been-fully-exploited-their-characters-depend-upon-the-deelopment-of-the-gametophyte-to-the-highest-condition-in-which-it-is-seen-in-land-vegetation-the-details-of-this-development-run-parallel-with-those-of-the-sporophyte-in-vascular-plants-so-that-the-two-present-a-series-of-image232323130.html
RMRDY6EJ–. Botany of the living plant. Botany. MUSCI AND HEPATICAE 369 out. In any organism with a life-cycle punctuated by the two stages of the spore and the zygote, there are two possibilities of somatic expan- sion, viz. in the diploid sporophyte and in the haploid gametophyte. In the Bryophytes the second alternative has been fully exploited. Their characters depend upon the de'elopment of the gametophyte to the highest condition in which it is seen in Land Vegetation. The details of this development run parallel with those of the sporophyte in Vascular Plants, so that the two present a series of
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. A manual of zoology. Zoology. Fig. 146.â1-7. Develupmentof Coccidium schuhetgi (afterSthaudinn). i, entrance of sporozoites in cell; 2, its growth: 3, nuclear multiplication; 4, division into mero- zoites; 5, macro- and microgametes; 5, zygote diided into four sporozoites. 8-11, Emeria stieda: (after Wasiele«sky und Metzner). 8, autoinfection (progamic increase); 9, formation of sporobLists, 10, change of spores into sporozoites; 11, spore "with t^^â o sporozoites, more enlarged; c, s, sporozoite; e, epithelial cell; k, n, nucleus; nn, micro- gamete; 0, macrogamete; r residual body; s Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-manual-of-zoology-zoology-fig-1461-7-develupmentof-coccidium-schuhetgi-aftersthaudinn-i-entrance-of-sporozoites-in-cell-2-its-growth-3-nuclear-multiplication-4-division-into-mero-zoites-5-macro-and-microgametes-5-zygote-diided-into-four-sporozoites-8-11-emeria-stieda-after-wasielesky-und-metzner-8-autoinfection-progamic-increase-9-formation-of-sporoblists-10-change-of-spores-into-sporozoites-11-spore-quotwith-t-o-sporozoites-more-enlarged-c-s-sporozoite-e-epithelial-cell-k-n-nucleus-nn-micro-gamete-0-macrogamete-r-residual-body-s-image216442444.html
RMPG3PF8–. A manual of zoology. Zoology. Fig. 146.â1-7. Develupmentof Coccidium schuhetgi (afterSthaudinn). i, entrance of sporozoites in cell; 2, its growth: 3, nuclear multiplication; 4, division into mero- zoites; 5, macro- and microgametes; 5, zygote diided into four sporozoites. 8-11, Emeria stieda: (after Wasiele«sky und Metzner). 8, autoinfection (progamic increase); 9, formation of sporobLists, 10, change of spores into sporozoites; 11, spore "with t^^â o sporozoites, more enlarged; c, s, sporozoite; e, epithelial cell; k, n, nucleus; nn, micro- gamete; 0, macrogamete; r residual body; s
. A manual of botany. Botany. 176 MANUAL OF BOTANY The apex of the tube comes to the summit of the macrospore, where the necks of the archegonia are situated. It pierces the coat of the spore and either enters the neck of a single arche- gonium or spreads over several. A male gamete is extruded from the tip into the oosphere or oospheres as the case may be, and the nuclei of the two gametes fuse to form the nucleus of the new zygote. This is the general arrangement throughout the group ; but variations are found in some Fig. 928. forms, particularly in the Gnetacese. The fate of the zygote dif Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-manual-of-botany-botany-176-manual-of-botany-the-apex-of-the-tube-comes-to-the-summit-of-the-macrospore-where-the-necks-of-the-archegonia-are-situated-it-pierces-the-coat-of-the-spore-and-either-enters-the-neck-of-a-single-arche-gonium-or-spreads-over-several-a-male-gamete-is-extruded-from-the-tip-into-the-oosphere-or-oospheres-as-the-case-may-be-and-the-nuclei-of-the-two-gametes-fuse-to-form-the-nucleus-of-the-new-zygote-this-is-the-general-arrangement-throughout-the-group-but-variations-are-found-in-some-fig-928-forms-particularly-in-the-gnetacese-the-fate-of-the-zygote-dif-image232377523.html
RMRE1KW7–. A manual of botany. Botany. 176 MANUAL OF BOTANY The apex of the tube comes to the summit of the macrospore, where the necks of the archegonia are situated. It pierces the coat of the spore and either enters the neck of a single arche- gonium or spreads over several. A male gamete is extruded from the tip into the oosphere or oospheres as the case may be, and the nuclei of the two gametes fuse to form the nucleus of the new zygote. This is the general arrangement throughout the group ; but variations are found in some Fig. 928. forms, particularly in the Gnetacese. The fate of the zygote dif
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. Text-book of embryology. Embryology. I SEGMENTATION 5 character," and that is unfortunately not justified by our knowledge so far as it goes at present. SEGMENTATION The first important steps in the evolution of the unicellular Zygote into the multicellular adult are seen in the process of Segmentation which is, in fact, a process of mitotic cell division showing special peculiarities in different groups of the Vertebrata. .During this process there appear in succession on the surface of the egg grooves which gradually deepen and eventually divide the egg incompletely or completely into Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/text-book-of-embryology-embryology-i-segmentation-5-characterquot-and-that-is-unfortunately-not-justified-by-our-knowledge-so-far-as-it-goes-at-present-segmentation-the-first-important-steps-in-the-evolution-of-the-unicellular-zygote-into-the-multicellular-adult-are-seen-in-the-process-of-segmentation-which-is-in-fact-a-process-of-mitotic-cell-division-showing-special-peculiarities-in-different-groups-of-the-vertebrata-during-this-process-there-appear-in-succession-on-the-surface-of-the-egg-grooves-which-gradually-deepen-and-eventually-divide-the-egg-incompletely-or-completely-into-image232128539.html
RMRDJA8Y–. Text-book of embryology. Embryology. I SEGMENTATION 5 character," and that is unfortunately not justified by our knowledge so far as it goes at present. SEGMENTATION The first important steps in the evolution of the unicellular Zygote into the multicellular adult are seen in the process of Segmentation which is, in fact, a process of mitotic cell division showing special peculiarities in different groups of the Vertebrata. .During this process there appear in succession on the surface of the egg grooves which gradually deepen and eventually divide the egg incompletely or completely into
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. Principles of modern biology. Biology. 210 - Multicellular Plants do not adhere to any standard type of life cycle. The commonest type of cycle is ex- hibited by Spirogyra (p. 168), and Ocdo- gonium (Fig. 12-8). In both these algae, the colony is composed of haploid cells; and any cell of the filament can give rise to one or more gametes. Accordingly, these plants are equivalent to the gametophyte generation in the higher plants. However, scarcely any sporophyte generation can be recognized, be- cause the zygote divides meiotically as soon as it begins to germinate, and all the cells of the Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/principles-of-modern-biology-biology-210-multicellular-plants-do-not-adhere-to-any-standard-type-of-life-cycle-the-commonest-type-of-cycle-is-ex-hibited-by-spirogyra-p-168-and-ocdo-gonium-fig-12-8-in-both-these-algae-the-colony-is-composed-of-haploid-cells-and-any-cell-of-the-filament-can-give-rise-to-one-or-more-gametes-accordingly-these-plants-are-equivalent-to-the-gametophyte-generation-in-the-higher-plants-however-scarcely-any-sporophyte-generation-can-be-recognized-be-cause-the-zygote-divides-meiotically-as-soon-as-it-begins-to-germinate-and-all-the-cells-of-the-image232317258.html
RMRDXY0X–. Principles of modern biology. Biology. 210 - Multicellular Plants do not adhere to any standard type of life cycle. The commonest type of cycle is ex- hibited by Spirogyra (p. 168), and Ocdo- gonium (Fig. 12-8). In both these algae, the colony is composed of haploid cells; and any cell of the filament can give rise to one or more gametes. Accordingly, these plants are equivalent to the gametophyte generation in the higher plants. However, scarcely any sporophyte generation can be recognized, be- cause the zygote divides meiotically as soon as it begins to germinate, and all the cells of the
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. Text-book of embryology. Embryology. 612 INVEETEBEATA OIIAP. found, in all the divisions which occur during the development of the egg asters are formed. As the zygote-nucleus moves inwards it draws with it the clear cytoplasm, leaving most of the yellow cyto- plasm behind. Some clear cytoplasm, however, is left at the surface as a narrow band above the yellow crescent, and some yellow cytoplasm moves inwards. The egg is now ready to undergo the first cleavage.. Fig. 443.—Stages in the segmentation of the egg of Cynthia partita. (After Conldin.) [The different coloured cytoplasms are indicat Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/text-book-of-embryology-embryology-612-inveetebeata-oiiap-found-in-all-the-divisions-which-occur-during-the-development-of-the-egg-asters-are-formed-as-the-zygote-nucleus-moves-inwards-it-draws-with-it-the-clear-cytoplasm-leaving-most-of-the-yellow-cyto-plasm-behind-some-clear-cytoplasm-however-is-left-at-the-surface-as-a-narrow-band-above-the-yellow-crescent-and-some-yellow-cytoplasm-moves-inwards-the-egg-is-now-ready-to-undergo-the-first-cleavage-fig-443stages-in-the-segmentation-of-the-egg-of-cynthia-partita-after-conldin-the-different-coloured-cytoplasms-are-indicat-image232126162.html
RMRDJ782–. Text-book of embryology. Embryology. 612 INVEETEBEATA OIIAP. found, in all the divisions which occur during the development of the egg asters are formed. As the zygote-nucleus moves inwards it draws with it the clear cytoplasm, leaving most of the yellow cyto- plasm behind. Some clear cytoplasm, however, is left at the surface as a narrow band above the yellow crescent, and some yellow cytoplasm moves inwards. The egg is now ready to undergo the first cleavage.. Fig. 443.—Stages in the segmentation of the egg of Cynthia partita. (After Conldin.) [The different coloured cytoplasms are indicat
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. Mendelism. Mendel's law. IV PRESENCE AND ABSENCE THEORY 31 ing to the dominant character or a definite something corresponding to the recessive character, and that these somethings whatever they were could not coexist in any- single gamete. For these somethings we shall in future use the term factor. The factor, then, is what corre- sponds in the gamete to the tinit-character that appears in some shape or other in the development of the zygote. Tallness in the pea is a imit-character, and the gametes in. Fig. 3- Two double and an ordinary single primula flower. This form of double is recessi Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/mendelism-mendels-law-iv-presence-and-absence-theory-31-ing-to-the-dominant-character-or-a-definite-something-corresponding-to-the-recessive-character-and-that-these-somethings-whatever-they-were-could-not-coexist-in-any-single-gamete-for-these-somethings-we-shall-in-future-use-the-term-factor-the-factor-then-is-what-corre-sponds-in-the-gamete-to-the-tinit-character-that-appears-in-some-shape-or-other-in-the-development-of-the-zygote-tallness-in-the-pea-is-a-imit-character-and-the-gametes-in-fig-3-two-double-and-an-ordinary-single-primula-flower-this-form-of-double-is-recessi-image232210637.html
RMRDP311–. Mendelism. Mendel's law. IV PRESENCE AND ABSENCE THEORY 31 ing to the dominant character or a definite something corresponding to the recessive character, and that these somethings whatever they were could not coexist in any- single gamete. For these somethings we shall in future use the term factor. The factor, then, is what corre- sponds in the gamete to the tinit-character that appears in some shape or other in the development of the zygote. Tallness in the pea is a imit-character, and the gametes in. Fig. 3- Two double and an ordinary single primula flower. This form of double is recessi
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. A manual of elementary zoology . Zoology. 136 MANUAL OF ELEMENTARY ZOOLOGY place. The male pronucleus of each conjugant passes over into the other and fuses with the female pronucleus of the latter. The body which belonged to each conjugant comes thus to contain a micronucleus of mixed origin. It is, in fact, a zygote. The zygotes separate and are known as exconjugants. Immediately after separa- tion the meganucleus degenerates, splitting up into shreds, which disappear. Thus the meganucleus resem- bles in the fact of its mortality the body-cells of the frog, though the body as a whole has t Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/a-manual-of-elementary-zoology-zoology-136-manual-of-elementary-zoology-place-the-male-pronucleus-of-each-conjugant-passes-over-into-the-other-and-fuses-with-the-female-pronucleus-of-the-latter-the-body-which-belonged-to-each-conjugant-comes-thus-to-contain-a-micronucleus-of-mixed-origin-it-is-in-fact-a-zygote-the-zygotes-separate-and-are-known-as-exconjugants-immediately-after-separa-tion-the-meganucleus-degenerates-splitting-up-into-shreds-which-disappear-thus-the-meganucleus-resem-bles-in-the-fact-of-its-mortality-the-body-cells-of-the-frog-though-the-body-as-a-whole-has-t-image232123641.html
RMRDJ421–. A manual of elementary zoology . Zoology. 136 MANUAL OF ELEMENTARY ZOOLOGY place. The male pronucleus of each conjugant passes over into the other and fuses with the female pronucleus of the latter. The body which belonged to each conjugant comes thus to contain a micronucleus of mixed origin. It is, in fact, a zygote. The zygotes separate and are known as exconjugants. Immediately after separa- tion the meganucleus degenerates, splitting up into shreds, which disappear. Thus the meganucleus resem- bles in the fact of its mortality the body-cells of the frog, though the body as a whole has t
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 52 ALTERNATING GENERATIONS one generation and forms the starting-point for the next generation : the older usage based upon this obvious fact is, therefore, to be preferred, and the spore may be still held to be the obvious boundary between the two generations. The gametophyte, or haploid phase, will then be recognised as extending from the spore to the zygote in each cycle, and it shows " n" chromosomes normally in all its nuclear divisions: the sporophyte, or diploid phase, is recognised a Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-origin-of-a-land-flora-a-theory-based-upon-the-facts-of-alternation-plant-morphology-52-alternating-generations-one-generation-and-forms-the-starting-point-for-the-next-generation-the-older-usage-based-upon-this-obvious-fact-is-therefore-to-be-preferred-and-the-spore-may-be-still-held-to-be-the-obvious-boundary-between-the-two-generations-the-gametophyte-or-haploid-phase-will-then-be-recognised-as-extending-from-the-spore-to-the-zygote-in-each-cycle-and-it-shows-quot-nquot-chromosomes-normally-in-all-its-nuclear-divisions-the-sporophyte-or-diploid-phase-is-recognised-a-image232309414.html
RMRDXH0P–. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 52 ALTERNATING GENERATIONS one generation and forms the starting-point for the next generation : the older usage based upon this obvious fact is, therefore, to be preferred, and the spore may be still held to be the obvious boundary between the two generations. The gametophyte, or haploid phase, will then be recognised as extending from the spore to the zygote in each cycle, and it shows " n" chromosomes normally in all its nuclear divisions: the sporophyte, or diploid phase, is recognised a
. The physiology of reproduction. Reproduction. FERTILISATION 189 the segmentation nucleus (as the nucleus formed by the union of the two pronuclei is called). In the segmentation nucleus the normal number of chromosomes characteristic of the species is once more restored. The oosperm, or zygote, produced in this way is the starting-point of a long series of cell divisions which culminate in the formation of a new, completely developed individual. Jenkinson, who has carried out a series of experiments in- tended to elucidate the physical processes occurring in fertihsa- tion, draws the conclus Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-physiology-of-reproduction-reproduction-fertilisation-189-the-segmentation-nucleus-as-the-nucleus-formed-by-the-union-of-the-two-pronuclei-is-called-in-the-segmentation-nucleus-the-normal-number-of-chromosomes-characteristic-of-the-species-is-once-more-restored-the-oosperm-or-zygote-produced-in-this-way-is-the-starting-point-of-a-long-series-of-cell-divisions-which-culminate-in-the-formation-of-a-new-completely-developed-individual-jenkinson-who-has-carried-out-a-series-of-experiments-in-tended-to-elucidate-the-physical-processes-occurring-in-fertihsa-tion-draws-the-conclus-image232353805.html
RMRE0HJ5–. The physiology of reproduction. Reproduction. FERTILISATION 189 the segmentation nucleus (as the nucleus formed by the union of the two pronuclei is called). In the segmentation nucleus the normal number of chromosomes characteristic of the species is once more restored. The oosperm, or zygote, produced in this way is the starting-point of a long series of cell divisions which culminate in the formation of a new, completely developed individual. Jenkinson, who has carried out a series of experiments in- tended to elucidate the physical processes occurring in fertihsa- tion, draws the conclus
. Plant genetics . Heredity; Mendel's law; Plant breeding. SPOROPHYTE INDIVIDUAL 8 CHROMOSOMES CAMETOPHYTE INDIVIDUAL 4 CHROMOSOMES ZYGOTE 8 CHROMOSOMES I FERTILIZATION I v-i. Fig. 28.—Diagram representing life-history of a higher plant as regards chromosome number. by fig. 29. When the reduction division occurs it means that 4 of these chromosomes will go to each of the two resulting nuclei. When this happens, are the chromosomes chosen indiscriminately? It has been learned that there is a certain limitation in the choice,. Please note that these images are extracted from scanned page images Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/plant-genetics-heredity-mendels-law-plant-breeding-sporophyte-individual-8-chromosomes-cametophyte-individual-4-chromosomes-zygote-8-chromosomes-i-fertilization-i-v-i-fig-28diagram-representing-life-history-of-a-higher-plant-as-regards-chromosome-number-by-fig-29-when-the-reduction-division-occurs-it-means-that-4-of-these-chromosomes-will-go-to-each-of-the-two-resulting-nuclei-when-this-happens-are-the-chromosomes-chosen-indiscriminately-it-has-been-learned-that-there-is-a-certain-limitation-in-the-choice-please-note-that-these-images-are-extracted-from-scanned-page-images-image232012092.html
RMRDD1P4–. Plant genetics . Heredity; Mendel's law; Plant breeding. SPOROPHYTE INDIVIDUAL 8 CHROMOSOMES CAMETOPHYTE INDIVIDUAL 4 CHROMOSOMES ZYGOTE 8 CHROMOSOMES I FERTILIZATION I v-i. Fig. 28.—Diagram representing life-history of a higher plant as regards chromosome number. by fig. 29. When the reduction division occurs it means that 4 of these chromosomes will go to each of the two resulting nuclei. When this happens, are the chromosomes chosen indiscriminately? It has been learned that there is a certain limitation in the choice,. Please note that these images are extracted from scanned page images
. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 268 BRYOPHYTA The development of the sporogonium has been carefully studied in Anthoceros by Campbell.1 The early segmentations result in three tiers composed of four cells each (Fig. 130 a): of these the lowest is derived from the hypobasal half of the zygote, and it forms the main part, if not indeed the whole of the foot. The highest tier gives rise to the primary capsule, while from the intermediate zone derived from the second tier the meristematic part of the older sporogonium is formed (Fig. 13 Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/the-origin-of-a-land-flora-a-theory-based-upon-the-facts-of-alternation-plant-morphology-268-bryophyta-the-development-of-the-sporogonium-has-been-carefully-studied-in-anthoceros-by-campbell1-the-early-segmentations-result-in-three-tiers-composed-of-four-cells-each-fig-130-a-of-these-the-lowest-is-derived-from-the-hypobasal-half-of-the-zygote-and-it-forms-the-main-part-if-not-indeed-the-whole-of-the-foot-the-highest-tier-gives-rise-to-the-primary-capsule-while-from-the-intermediate-zone-derived-from-the-second-tier-the-meristematic-part-of-the-older-sporogonium-is-formed-fig-13-image232312401.html
RMRDXMRD–. The origin of a land flora, a theory based upon the facts of alternation. Plant morphology. 268 BRYOPHYTA The development of the sporogonium has been carefully studied in Anthoceros by Campbell.1 The early segmentations result in three tiers composed of four cells each (Fig. 130 a): of these the lowest is derived from the hypobasal half of the zygote, and it forms the main part, if not indeed the whole of the foot. The highest tier gives rise to the primary capsule, while from the intermediate zone derived from the second tier the meristematic part of the older sporogonium is formed (Fig. 13
. Text-book of embryology. Embryology. 12 INVEETEBEATA CHAP. of the egg results; in most cases this takes the form of simultaneous division into four equal parts. In the case of large eggs, like those of birds, it appears that normally a considerable number of spermatozoa enter the egg. One only unites with the female pronucleus and forms the zygote nucleus, the rest divide independently and form groups of small cells which are produced by the aggregation of the cytoplasm round the products of their division. Soon, however, the cells formed round the daughters of the zygote nucleus crush out a Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/text-book-of-embryology-embryology-12-inveetebeata-chap-of-the-egg-results-in-most-cases-this-takes-the-form-of-simultaneous-division-into-four-equal-parts-in-the-case-of-large-eggs-like-those-of-birds-it-appears-that-normally-a-considerable-number-of-spermatozoa-enter-the-egg-one-only-unites-with-the-female-pronucleus-and-forms-the-zygote-nucleus-the-rest-divide-independently-and-form-groups-of-small-cells-which-are-produced-by-the-aggregation-of-the-cytoplasm-round-the-products-of-their-division-soon-however-the-cells-formed-round-the-daughters-of-the-zygote-nucleus-crush-out-a-image232128428.html
RMRDJA50–. Text-book of embryology. Embryology. 12 INVEETEBEATA CHAP. of the egg results; in most cases this takes the form of simultaneous division into four equal parts. In the case of large eggs, like those of birds, it appears that normally a considerable number of spermatozoa enter the egg. One only unites with the female pronucleus and forms the zygote nucleus, the rest divide independently and form groups of small cells which are produced by the aggregation of the cytoplasm round the products of their division. Soon, however, the cells formed round the daughters of the zygote nucleus crush out a
. Text-book of embryology. Embryology. SEGMENTATION 13 in an egg in which the proportion of yolk.present approaches the maximum. In this case the zygote nucleus commonly undergoes two mitotic divisions before there is any external symptom of segmentation of the cytoplasm. Usually a single furrow makes its appearance first, incising the surface of the germinal disc but not extending to its periphery (Fig. 8, A). Occasionally a second regular furrow makes its appearance intersecting the first at right angles. Fig. 7.—Vertical (meridional) sections through blastulae of Frog. (From Morgan, 1897.) Stock Photohttps://www.alamy.com/image-license-details/?v=1https://www.alamy.com/text-book-of-embryology-embryology-segmentation-13-in-an-egg-in-which-the-proportion-of-yolkpresent-approaches-the-maximum-in-this-case-the-zygote-nucleus-commonly-undergoes-two-mitotic-divisions-before-there-is-any-external-symptom-of-segmentation-of-the-cytoplasm-usually-a-single-furrow-makes-its-appearance-first-incising-the-surface-of-the-germinal-disc-but-not-extending-to-its-periphery-fig-8-a-occasionally-a-second-regular-furrow-makes-its-appearance-intersecting-the-first-at-right-angles-fig-7vertical-meridional-sections-through-blastulae-of-frog-from-morgan-1897-image232128529.html
RMRDJA8H–. Text-book of embryology. Embryology. SEGMENTATION 13 in an egg in which the proportion of yolk.present approaches the maximum. In this case the zygote nucleus commonly undergoes two mitotic divisions before there is any external symptom of segmentation of the cytoplasm. Usually a single furrow makes its appearance first, incising the surface of the germinal disc but not extending to its periphery (Fig. 8, A). Occasionally a second regular furrow makes its appearance intersecting the first at right angles. Fig. 7.—Vertical (meridional) sections through blastulae of Frog. (From Morgan, 1897.)
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