The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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35개의 결과 중 1 - 5개
47 페이지
... sexual elements have different functions -The evidence from parthenogenesis - Polar - cell hypothesis -The evidence from hybrids , from variation , and from struc- tures confined to one sex - The pangenesis hypothesis recog- nizes no ...
... sexual elements have different functions -The evidence from parthenogenesis - Polar - cell hypothesis -The evidence from hybrids , from variation , and from struc- tures confined to one sex - The pangenesis hypothesis recog- nizes no ...
51 페이지
... sexual elements . Hence , speaking strictly , it is not the reproductive elements nor the buds which gene- rate new organisms , but the cells themselves throughout the body . These assumptions constitute the provisional hypothesis of ...
... sexual elements . Hence , speaking strictly , it is not the reproductive elements nor the buds which gene- rate new organisms , but the cells themselves throughout the body . These assumptions constitute the provisional hypothesis of ...
53 페이지
... Sexual Elements Perform Different Functions in Heredity . There is another objection which seems to me to be of almost equal weight , but which has never , so far as I am aware , been pointed out . The early writers upon heredity ...
... Sexual Elements Perform Different Functions in Heredity . There is another objection which seems to me to be of almost equal weight , but which has never , so far as I am aware , been pointed out . The early writers upon heredity ...
54 페이지
... elements ; but in modern times we actually find that thinkers have gone to this opposite extremity of the subject , and have either tacitly implied or directly accepted the view that the two sexual elements play similar parts in ...
... elements ; but in modern times we actually find that thinkers have gone to this opposite extremity of the subject , and have either tacitly implied or directly accepted the view that the two sexual elements play similar parts in ...
70 페이지
... notice . This hypoth- esis , which was first advanced by the late Prof. McCrady , and which is stated at length in Balfour's Treatise on Comparative Embryology , is that each sexual element originally contains 70 Heredity .
... notice . This hypoth- esis , which was first advanced by the late Prof. McCrady , and which is stated at length in Balfour's Treatise on Comparative Embryology , is that each sexual element originally contains 70 Heredity .
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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