The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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44 페이지
... Pangenesis , " Proc . Amer . Assn . , 1876 , and American Naturalist , March , 1877 ) , and it had been stated as long ago as 1849 by Prof. Owen , in his paper on Parthenogenesis , although this author , in his " Anatomy of Vertebrates ...
... Pangenesis , " Proc . Amer . Assn . , 1876 , and American Naturalist , March , 1877 ) , and it had been stated as long ago as 1849 by Prof. Owen , in his paper on Parthenogenesis , although this author , in his " Anatomy of Vertebrates ...
47 페이지
... pangenesis hypothesis - This is an evolution hypothe- sis , since all the characteristics of the adult are supposed to be latent in the germ - Miscellaneous objections to it - These objections do not show that it conflicts with fact ...
... pangenesis hypothesis - This is an evolution hypothe- sis , since all the characteristics of the adult are supposed to be latent in the germ - Miscellaneous objections to it - These objections do not show that it conflicts with fact ...
48 페이지
... Pangenesis . In contrast to the views already quoted we have the well - known pangenesis hypothesis of Darwin , an hypoth- esis which is thoroughly one of evolution , since Darwin believes that the whole organization of the species is ...
... Pangenesis . In contrast to the views already quoted we have the well - known pangenesis hypothesis of Darwin , an hypoth- esis which is thoroughly one of evolution , since Darwin believes that the whole organization of the species is ...
49 페이지
... pangenesis , which implies that the whole organization , in the sense of every separate atom or unit , reproduces itself . Hence ovules and pollen grains - the fertilized seed or egg , as well as buds - include and con- sist of a ...
... pangenesis , which implies that the whole organization , in the sense of every separate atom or unit , reproduces itself . Hence ovules and pollen grains - the fertilized seed or egg , as well as buds - include and con- sist of a ...
51 페이지
... pangenesis . " Darwin's gemmules are , of course , entirely imaginary , that is , a belief in their existence does not rest upon direct observation . We cannot deny that the hypothesis furnishes an explanation of most of the phenomena ...
... pangenesis . " Darwin's gemmules are , of course , entirely imaginary , that is , a belief in their existence does not rest upon direct observation . We cannot deny that the hypothesis furnishes an explanation of most of the phenomena ...
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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