The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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83 페이지
... fortuitous nor due to the direct and definite modifying influence of changed conditions . A change in the environment of a cell causes it to throw off gem- mules , and thus to transmit to descendants a tendency to vary in the part which ...
... fortuitous nor due to the direct and definite modifying influence of changed conditions . A change in the environment of a cell causes it to throw off gem- mules , and thus to transmit to descendants a tendency to vary in the part which ...
156 페이지
... Fortuitous , the Evolution of a Complicated Organ composed of Many Parts by Nat- ural Selection demands a Period of Time which is almost Infinite . This obvious objection to the law of natural selec- tion has been so frequently ...
... Fortuitous , the Evolution of a Complicated Organ composed of Many Parts by Nat- ural Selection demands a Period of Time which is almost Infinite . This obvious objection to the law of natural selec- tion has been so frequently ...
159 페이지
... fortuitous the number of generations which would be necessary in order to convert a species with black hair into a species with every hair brown or with every hair red is almost inconceivable , but this difficulty entirely disappears as ...
... fortuitous the number of generations which would be necessary in order to convert a species with black hair into a species with every hair brown or with every hair red is almost inconceivable , but this difficulty entirely disappears as ...
163 페이지
... fortuitous the chance against this is very great indeed . While there is no reason to doubt that natural selection might bring about all the changes which have led to the formation of a complicated organ , by the preservation of fortuitous ...
... fortuitous the chance against this is very great indeed . While there is no reason to doubt that natural selection might bring about all the changes which have led to the formation of a complicated organ , by the preservation of fortuitous ...
164 페이지
... fortuitous involves us in grave difficul- ties , but on the other hand we find scarcely any evidence to show that permanent hereditary race modifications are ever directly produced by the action of external con- ditions , while we do ...
... fortuitous involves us in grave difficul- ties , but on the other hand we find scarcely any evidence to show that permanent hereditary race modifications are ever directly produced by the action of external con- ditions , while we do ...
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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