The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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53개의 결과 중 1 - 5개
13 페이지
... acquired through a long series of modifi- cations ; that all the wonderful adaptations which fit animals to their surroundings , and meet their particular needs , has been evolved step by step by the natural se- lection of the fittest ...
... acquired through a long series of modifi- cations ; that all the wonderful adaptations which fit animals to their surroundings , and meet their particular needs , has been evolved step by step by the natural se- lection of the fittest ...
28 페이지
... acquired these prop- erties ? If it is simply an unspecialized cell ; if , as Ge- genbauer states , " the egg is nothing more nor less than a cell ; the egg - cell does not differ from other cells in any essential points " ( Comp . Anat ...
... acquired these prop- erties ? If it is simply an unspecialized cell ; if , as Ge- genbauer states , " the egg is nothing more nor less than a cell ; the egg - cell does not differ from other cells in any essential points " ( Comp . Anat ...
29 페이지
... acquired the distinctive features of either of them ; that a little farther back we trace this species to an ancestor with still wider relationships . Every day the evidence grows stronger to show that more complete knowledge will ...
... acquired the distinctive features of either of them ; that a little farther back we trace this species to an ancestor with still wider relationships . Every day the evidence grows stronger to show that more complete knowledge will ...
37 페이지
... acquired through adaptation in the course of their evolution . " I have shown that each organic form is the neces- sary product of two mechanical factors - an inner factor , heredity , and an outer factor , variability , or a power of ...
... acquired through adaptation in the course of their evolution . " I have shown that each organic form is the neces- sary product of two mechanical factors - an inner factor , heredity , and an outer factor , variability , or a power of ...
43 페이지
... acquired all the characteristics of the species , the young neverthe- less inherit these characteristics . The young which are born by a Cycedomia larva inherit all the characteristics of the full - grown adult insect , and a bull may ...
... acquired all the characteristics of the species , the young neverthe- less inherit these characteristics . The young which are born by a Cycedomia larva inherit all the characteristics of the full - grown adult insect , and a bull may ...
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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