The Physical Basis of SocietyD.Appleton, 1928 - 526 من الصفحات |
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الصفحة 299
... ovum certain cells are set aside and thereafter take no part in the development of the body but become the ancestors of the germ cells . It is impossible to see a similar process taking place in the embryos of mammals but there is every ...
... ovum certain cells are set aside and thereafter take no part in the development of the body but become the ancestors of the germ cells . It is impossible to see a similar process taking place in the embryos of mammals but there is every ...
الصفحة 305
... ovum of the mother carries a determiner for white and every sperm of the father a determiner for black . Hence , in so far as color is con- cerned , all the offspring are simplex or heterozygous , and all are black as black is dominant ...
... ovum of the mother carries a determiner for white and every sperm of the father a determiner for black . Hence , in so far as color is con- cerned , all the offspring are simplex or heterozygous , and all are black as black is dominant ...
الصفحة 306
... ovum being assumed to be a matter of chance , the percentage of any given type of offspring is solely a question of mathematical average . The larger the number of cases the more closely will the actual count approximate the ideal . On ...
... ovum being assumed to be a matter of chance , the percentage of any given type of offspring is solely a question of mathematical average . The larger the number of cases the more closely will the actual count approximate the ideal . On ...
الصفحة 362
... ovum as forty - eight . It is now known that both have forty - eight but the sperm contains one of ordinary rod shape ( now called X ) while the second is spherical ( called Y ) . In the reduction division in the female , twenty - four ...
... ovum as forty - eight . It is now known that both have forty - eight but the sperm contains one of ordinary rod shape ( now called X ) while the second is spherical ( called Y ) . In the reduction division in the female , twenty - four ...
الصفحة 521
... Ovum , 57 , 298ff . See also Sex . Owl , 52 , 53 , 58 , 124 , 125 , 139 , 140 Phosphorescent organisms , 59f . Phosphorus , 8 , 11 , 22 , 90f . , 186 Phylloxera , hickory , 358 Pickerel , 102 Pigeons , domestic , 124 , 164 ; pas- senger ...
... Ovum , 57 , 298ff . See also Sex . Owl , 52 , 53 , 58 , 124 , 125 , 139 , 140 Phosphorescent organisms , 59f . Phosphorus , 8 , 11 , 22 , 90f . , 186 Phylloxera , hickory , 358 Pickerel , 102 Pigeons , domestic , 124 , 164 ; pas- senger ...
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acres Africa America appears areas Asia atoms average bacteria believe birds body carbon carbon dioxide cause cent century cephalic index changes characters chromosomes civilization climate color common copper crops cultivated culture danger Darwin death rate destroy disease domestic early earth eggs environment Europe European evidence fact feeble-minded females fish forms germ cells given heredity human Ibid important increase Indians individual inheritance insane insects iron killed known land later light living male man's marriage metals miles natural selection nature Negro neolithic organisms ovum oxygen Pará rubber tree parasites physical population possible pounds present problems produced R. S. LULL race seeds seems social South South America species square mile supply T. H. MORGAN temperature things thousand tion to-day trees tropics types United wild woman women