The Law of Heredity: A Study of the Cause of Variation, and the Origin of Living OrganismsJ. Murphy, 1883 - 336페이지 |
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11개의 결과 중 1 - 5개
105 페이지
... plumage and long tail - feathers of the cock , assume the habits of the male , and even learn to crow . The bad character , as layers , of crowing hens , has even given rise to a proverb . According to Darwin , Waterton gives a curious ...
... plumage and long tail - feathers of the cock , assume the habits of the male , and even learn to crow . The bad character , as layers , of crowing hens , has even given rise to a proverb . According to Darwin , Waterton gives a curious ...
106 페이지
... plumage , voice , spurs and warlike disposition of the cock : when opposed to an enemy she would erect her hackels and show fight . Female deer often acquire the horns , peculiar hair , ears , odor , and sexual desire of the males . On ...
... plumage , voice , spurs and warlike disposition of the cock : when opposed to an enemy she would erect her hackels and show fight . Female deer often acquire the horns , peculiar hair , ears , odor , and sexual desire of the males . On ...
135 페이지
... plumage of the wild Gallus bankiva , and that this plumage was almost perfectly reproduced in one mag- nificent bird , the offspring of a black Spanish cock and a white silk hen , although either of these pure breeds may be reared by ...
... plumage of the wild Gallus bankiva , and that this plumage was almost perfectly reproduced in one mag- nificent bird , the offspring of a black Spanish cock and a white silk hen , although either of these pure breeds may be reared by ...
202 페이지
... plumage has been taken advantage of and modified . When the sexes of birds differ in beauty , in the power of singing , or in producing instrumental mu- sic , it is almost invariably the male which excels the fe- male . " This extract ...
... plumage has been taken advantage of and modified . When the sexes of birds differ in beauty , in the power of singing , or in producing instrumental mu- sic , it is almost invariably the male which excels the fe- male . " This extract ...
207 페이지
... plumage would render the female bird promi- nent while incubating , and would thus enable enemies to detect the presence of the nest . He believes that sinceincubating females are exposed to this danger , natu- ral selection has acted ...
... plumage would render the female bird promi- nent while incubating , and would thus enable enemies to detect the presence of the nest . He believes that sinceincubating females are exposed to this danger , natu- ral selection has acted ...
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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