The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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42개의 결과 중 1 - 5개
8 페이지
... fertilized and is carried inside the body of the mother until the new animal is matured ; that it is there nourished and built up from substances supplied through the body of a full - grown dog ; that it may be acted upon at this time ...
... fertilized and is carried inside the body of the mother until the new animal is matured ; that it is there nourished and built up from substances supplied through the body of a full - grown dog ; that it may be acted upon at this time ...
9 페이지
... fertilized , but it develops into a perfect worker , with all its wonderful structure and instincts , by virtue of ... fertilize them artificially , and then place them together in a tumbler of sea water , and expose them to exactly ...
... fertilized , but it develops into a perfect worker , with all its wonderful structure and instincts , by virtue of ... fertilize them artificially , and then place them together in a tumbler of sea water , and expose them to exactly ...
11 페이지
... fertilized eggs ; but in the lower forms of life another kind of reproduction , the development of new individuals by budding or by analogous processes , is even more common . Among the hydroids heredity may mani- fest itself by the ...
... fertilized eggs ; but in the lower forms of life another kind of reproduction , the development of new individuals by budding or by analogous processes , is even more common . Among the hydroids heredity may mani- fest itself by the ...
16 페이지
... fertilized by union with a male cell . 4. The ovum and male cell will not unite unless they are derived from organisms with the same or nearly the same systematic affinities . C 5. The new organism , whether produced sexually or ...
... fertilized by union with a male cell . 4. The ovum and male cell will not unite unless they are derived from organisms with the same or nearly the same systematic affinities . C 5. The new organism , whether produced sexually or ...
17 페이지
... fertilized ova differ in the following points from those produced asexually : a . As a rule the development of the egg embryo is indirect , and a more or less complicated metamorphosis or alternation of generations must be passed ...
... fertilized ova differ in the following points from those produced asexually : a . As a rule the development of the egg embryo is indirect , and a more or less complicated metamorphosis or alternation of generations must be passed ...
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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