Experimental Embryology |
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Page 3
... diploid number of chromosomes . Owing to the division of each chromosome by longitudinal splitting each daughter - cell at the first division also gets a full set . The process repeats itself , as in the normal egg , every time a cell ...
... diploid number of chromosomes . Owing to the division of each chromosome by longitudinal splitting each daughter - cell at the first division also gets a full set . The process repeats itself , as in the normal egg , every time a cell ...
Page 15
... ( diploid ) number of chromosomes to the egg . In some species of animals the sperm is supposed to bring in a formed body , the centrosome , which after division becomes the division - center of the egg . In other species it is supposed ...
... ( diploid ) number of chromosomes to the egg . In some species of animals the sperm is supposed to bring in a formed body , the centrosome , which after division becomes the division - center of the egg . In other species it is supposed ...
Page 60
... diploid . Correns ( '18 , '21 , '27 ) has shown in the dioecious plant , Melandrium ( which has more recently been shown to produce 1 In some snails there are two kinds of spermatozoa formed , typical and atypical ; and in some of these ...
... diploid . Correns ( '18 , '21 , '27 ) has shown in the dioecious plant , Melandrium ( which has more recently been shown to produce 1 In some snails there are two kinds of spermatozoa formed , typical and atypical ; and in some of these ...
Page 71
... haploid pollen tube and the diploid tissue of the female . It has been shown by direct observation that the rate of growth of the pollen tube in the tissue of the female is SELECTIVE FERTILIZATION AND SELF - STERILITY 71.
... haploid pollen tube and the diploid tissue of the female . It has been shown by direct observation that the rate of growth of the pollen tube in the tissue of the female is SELECTIVE FERTILIZATION AND SELF - STERILITY 71.
Page 74
... diploid number of 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 ...
... diploid number of 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 ...
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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