The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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35 페이지
... allied species of organisms , and each branch and twig of the tree corresponds to a greater or smaller group of descendants from a common ancestral form . This community of descent unites all the forms of a class , an order , and so on ...
... allied species of organisms , and each branch and twig of the tree corresponds to a greater or smaller group of descendants from a common ancestral form . This community of descent unites all the forms of a class , an order , and so on ...
101 페이지
... animals must be closely related ; they must belong to the same species or to two closely allied species . Since the individuals which belong to two closely related species are the de- scendants of a common , and not very remote , ancestral ...
... animals must be closely related ; they must belong to the same species or to two closely allied species . Since the individuals which belong to two closely related species are the de- scendants of a common , and not very remote , ancestral ...
119 페이지
... allied species has been the same , and they show in common everything except what has been acquired by each one since they diverged from their common ancestor . Crossing gives no way of showing whether these com- mon characteristics are ...
... allied species has been the same , and they show in common everything except what has been acquired by each one since they diverged from their common ancestor . Crossing gives no way of showing whether these com- mon characteristics are ...
121 페이지
... species . The common experience of floriculturists proves that the crossing and recrossing of distinct but allied plants , such as the species of Petunia , Calceolaria , Fuchsia , Verbena , etc. , induces excessive variability : hence ...
... species . The common experience of floriculturists proves that the crossing and recrossing of distinct but allied plants , such as the species of Petunia , Calceolaria , Fuchsia , Verbena , etc. , induces excessive variability : hence ...
125 페이지
... species , can breed together . Closely allied animals are alike in all respects , except as regards the slight differ- ences which distinguish species , varieties and individu- als from each other . Since no animals or plants can cross ...
... species , can breed together . Closely allied animals are alike in all respects , except as regards the slight differ- ences which distinguish species , varieties and individu- als from each other . Since no animals or plants can cross ...
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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