Are the Effects of Use and Disuse Inherited?: An Examination of the View Held by Spencer and DarwinMacmillan, 1890 - 156 páginas |
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Página x
... BIRDS OF OCEANIC ISLANDS DROOPING Ears and DETERIORATED INSTINCTS WINGS AND LEGS OF DUCKS AND FOWLS . PIGEON'S WINGS . · SHORTENED BREASTBONE IN PIGEONS . SHORTENED FEET IN PIGEONS SHORTENED LEGS OF RABBITS BLIND CAVE ANIMALS · 49 53 55 ...
... BIRDS OF OCEANIC ISLANDS DROOPING Ears and DETERIORATED INSTINCTS WINGS AND LEGS OF DUCKS AND FOWLS . PIGEON'S WINGS . · SHORTENED BREASTBONE IN PIGEONS . SHORTENED FEET IN PIGEONS SHORTENED LEGS OF RABBITS BLIND CAVE ANIMALS · 49 53 55 ...
Página 21
... bird in the meanwhile drawing upon its surplus energy , aided ( as I would suggest ) by the strengthening effect of increased use in the individual . Seeing that artificial selection of complicated variations has modified animals in ...
... bird in the meanwhile drawing upon its surplus energy , aided ( as I would suggest ) by the strengthening effect of increased use in the individual . Seeing that artificial selection of complicated variations has modified animals in ...
Página 49
... BIRDS OF OCEANIC ISLANDS . Darwin himself has pointed out that the rudi- mentary wings of island beetles , at first thought to be due to disuse , are mainly brought about by natural ... BIRDS . 49 REDUCED WINGS OF BIRDS OF OCEANIC ISLANDS.
... BIRDS OF OCEANIC ISLANDS . Darwin himself has pointed out that the rudi- mentary wings of island beetles , at first thought to be due to disuse , are mainly brought about by natural ... BIRDS . 49 REDUCED WINGS OF BIRDS OF OCEANIC ISLANDS.
Página 51
... birds that flew furthest would be most often carried away by storms and adverse winds . Reduced wings would keep the birds near the shelter and the food afforded by the island and its neighbourhood , and in some cases would become ...
... birds that flew furthest would be most often carried away by storms and adverse winds . Reduced wings would keep the birds near the shelter and the food afforded by the island and its neighbourhood , and in some cases would become ...
Página 52
... birds is paralleled by the remarkable thinness , & c . , of the shell of the " gigantic land - tortoise " of the ... bird and reptile alike through the absence of the mammalian rivals whose places they are evidently being modified to ...
... birds is paralleled by the remarkable thinness , & c . , of the shell of the " gigantic land - tortoise " of the ... bird and reptile alike through the absence of the mammalian rivals whose places they are evidently being modified to ...
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Términos y frases comunes
acquired characters acquired modifications alleged Animals and Plants appears artificial selection atavism attributed Aylesbury duck become birds bones breeds cause cent civilization concomitant variation Contemporary Review Crown 8vo cumulative Darwin Descent deterioration diminished diminution diseases domestic animals domestic rabbit duck effects of ancestral effects of disuse enlarged epilepsy evidence evil explanation eyes fact factor of evolution fancy pigeons father favoured Francis Darwin Francis Galton Galton gemmules guinea-pigs heredity Illustrations improvement incisors increased individual inherited effects inherited injuries inherited mutilations insects instances instincts jaws Lamarckian leg-bones legs lengthened muscles natural or artificial natural selection nervous neuter offspring organs Origin of Species pangenesis panmixia parents pigeons Plants under Domestication quasi-inheritance race Ray Lankester reduced wings relative reproductive elements sexual selection shortened Spencer spite of disuse spontaneous variations sternum structure suppose tameness teeth tend tendency theory thickened sole tion toes transmit true inheritance use-inheritance Variation of Animals weight Weismann wing-bones
Pasajes populares
Página 26 - For peculiar habits confined to the workers or sterile females, however long they might be followed, could not possibly affect the males and fertile females, which alone leave descendants. I am surprised that no one has hitherto advanced this demonstrative case of neuter insects, against the well-known doctrine of inherited habit, as advanced by Lamarck.