Experimental Embryology |
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Results 1-5 of 67
Page 18
... abnormal development . In a marine annelid , Platynereis megalops , in which fertiliza- tion is normally internal , Just ( '15 ) found that artificial fertiliza- tion outside the body may be brought about if sperm and eggs are mixed dry ...
... abnormal development . In a marine annelid , Platynereis megalops , in which fertiliza- tion is normally internal , Just ( '15 ) found that artificial fertiliza- tion outside the body may be brought about if sperm and eggs are mixed dry ...
Page 26
... activity is due to an abnormal condition of the egg , and that the changes observed by Chambers have no relation to normal fertilization . CHAPTER III ACTIVITY OF SPERMATOZOA IN most eggs that are 26 EXPERIMENTAL EMBRYOLOGY.
... activity is due to an abnormal condition of the egg , and that the changes observed by Chambers have no relation to normal fertilization . CHAPTER III ACTIVITY OF SPERMATOZOA IN most eggs that are 26 EXPERIMENTAL EMBRYOLOGY.
Page 80
... abnormal mitotic figure ( a triaster or tetraster ) which brings about an irregular distribution of the chromosomes , and abnormal types of cleavage . On the other hand , in a considerable number of cases , the mechanism is such that ...
... abnormal mitotic figure ( a triaster or tetraster ) which brings about an irregular distribution of the chromosomes , and abnormal types of cleavage . On the other hand , in a considerable number of cases , the mechanism is such that ...
Page 81
... abnormal polyspermy is that of the frog's egg in which normally only one sperm enters . Several may enter simultaneously if the egg is placed in concentrated sperm , or if kept under abnormal condi- tions . Such eggs break up generally ...
... abnormal polyspermy is that of the frog's egg in which normally only one sperm enters . Several may enter simultaneously if the egg is placed in concentrated sperm , or if kept under abnormal condi- tions . Such eggs break up generally ...
Page 84
... abnormalities , and even the most normal ones do not live more than a few days . Some of the causes of the abnormalities are apparent , such as the presence of fused areas in the mass , cells of unequal sizes , and cells with haploid ...
... abnormalities , and even the most normal ones do not live more than a few days . Some of the causes of the abnormalities are apparent , such as the presence of fused areas in the mass , cells of unequal sizes , and cells with haploid ...
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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