Experimental Embryology |
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Page 3
... chromosomes , the spermatozoön brings in another set ( as in normal development ) . The two sets combine into a single nucleus that has the diploid number of chromosomes . Owing to the division of each chromosome by longitudinal ...
... chromosomes , the spermatozoön brings in another set ( as in normal development ) . The two sets combine into a single nucleus that has the diploid number of chromosomes . Owing to the division of each chromosome by longitudinal ...
Page 8
... chromosomes bears no relation at all to the arrangement of the parts which the structures of the fully formed individual bear to each other . The developmental changes that we see and try to explain are supposed not to be primarily due ...
... chromosomes bears no relation at all to the arrangement of the parts which the structures of the fully formed individual bear to each other . The developmental changes that we see and try to explain are supposed not to be primarily due ...
Page 57
... chromosome , are slower in their passage up the tube of the oviduct of the bird or mammal than are the male - producing sperm with the smaller Y - chromosome , or with no sex - chromosome at all . If this should occur , more eggs might ...
... chromosome , are slower in their passage up the tube of the oviduct of the bird or mammal than are the male - producing sperm with the smaller Y - chromosome , or with no sex - chromosome at all . If this should occur , more eggs might ...
Page 74
... chromosomes ( a maternal and a paternal set ) , while the other blastomere divides with only a haploid ( maternal ) set of chromosomes . Boveri also found that the sperm - nucleus may not become incorporated into a dividing nucleus ...
... chromosomes ( a maternal and a paternal set ) , while the other blastomere divides with only a haploid ( maternal ) set of chromosomes . Boveri also found that the sperm - nucleus may not become incorporated into a dividing nucleus ...
Page 75
... chromosomes were set free and they divided , but , in the absence of a bipolar spindle , remained in situ . A new nuclear wall formed around the chromosomes , and a resting nucleus was formed . After a period of rest , the nucleus and ...
... chromosomes were set free and they divided , but , in the absence of a bipolar spindle , remained in situ . A new nuclear wall formed around the chromosomes , and a resting nucleus was formed . After a period of rest , the nucleus and ...
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Common terms and phrases
abnormal acid antipolar antipole appears Arbacia Arch archenteron aster axis become bilateral Biol blastomeres blastopore blastula Boveri cells centrifuged eggs Cerebratulus changes chromosomes cleavage plane compressed constricted cytoplasm determined diploid divide division dorsal lip Echinus ectoderm ectoplasm egg-nucleus embryo endoderm enter Entw.-Mech evidence experiments female fertilization fertilizin formation fragments frog's egg fused gastrula genes gray crescent half haploid hemisphere Hertwig hybrid hypertonic isolated blastomeres jelly Jour larvae later layer Lillie Loeb material median plane membrane mesoderm micromeres minutes Morgan neural plate normal egg normal embryo notochord nuclear nucleus number of chromosomes observed parthenogenesis Physiol pigment plutei polar body pole position posterior present produce protoplasm region right angles sea water sea-urchin eggs second cleavage segmentation self-fertilization shown in Fig side species Spemann sperm sperm-nucleus spermatozoa Sphaerechinus spindle stage Strongylocentrotus substance surface takes place tion Triton tube Ueber unfertilized eggs whole embryo yolk