The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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38개의 결과 중 1 - 5개
18 페이지
... parthenogenesis , are inter - re- lated in such a way that we must believe that they are different manifestations of the same power , and that they have been evolved one from the other . We know that direct development , metamorphosis ...
... parthenogenesis , are inter - re- lated in such a way that we must believe that they are different manifestations of the same power , and that they have been evolved one from the other . We know that direct development , metamorphosis ...
44 페이지
... Parthenogenesis , although this author , in his " Anatomy of Vertebrates , " after- wards states that he now believes it to be fundamentally It is plain , too , that in its second form Jäger's hypothesis is one of evolution , pure and ...
... Parthenogenesis , although this author , in his " Anatomy of Vertebrates , " after- wards states that he now believes it to be fundamentally It is plain , too , that in its second form Jäger's hypothesis is one of evolution , pure and ...
47 페이지
... parthenogenesis - Polar - cell hypothesis -The evidence from hybrids , from variation , and from struc- tures confined to one sex - The pangenesis hypothesis recog- nizes no such difference in the functions of the reproductive elements ...
... parthenogenesis - Polar - cell hypothesis -The evidence from hybrids , from variation , and from struc- tures confined to one sex - The pangenesis hypothesis recog- nizes no such difference in the functions of the reproductive elements ...
55 페이지
... Parthenogenesis shows beyond question that this is the case . Parthenogenesis . Siebold has proposed the term parthenogenesis for the power which is possessed by certain female animals , especially the arthropods , to produce ...
... Parthenogenesis shows beyond question that this is the case . Parthenogenesis . Siebold has proposed the term parthenogenesis for the power which is possessed by certain female animals , especially the arthropods , to produce ...
56 페이지
... parthenogenesis , and a short history of the subject seems the most effective means for accomplishing this purpose . Among the crustacea and insects , parthenogenesis is by no means unusual . It occurs in some groups where impregnation ...
... parthenogenesis , and a short history of the subject seems the most effective means for accomplishing this purpose . Among the crustacea and insects , parthenogenesis is by no means unusual . It occurs in some groups where impregnation ...
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acquired action adult alike allied species ancestor ancestral form asexual asexual reproduction become birds body breed characteristics color common conclusion confined crossing crustacea Daphnia Darwin Darwin says descendants domesticated animals domesticated pigeons embryo epigenesis evolution existence experience explanation fact female fertilized fortuitous fowls functions furnishes gemmules genera genus germ germinative vesicle give rise gradually greatly hereditary homology horns hybrid hydroids hypothesis individual influence inherited insects latent male cell male element males of allied medusa ment modification natural selection offspring ordinary origin origin of species ovum pangenesis parent parthenogenesis peculiarities perfect phenomena plants plastidules plumage present produced pure race reasons for believing reciprocal crosses reproductive elements resemblance result secondary sexual characters sexes sexual elements sexual reproduction sexual selection similar simply striped structure tendency to vary theory of heredity throw off gemmules tion transmission transmit true variable various young