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 24
... illustrations show , no simultaneous or concomitant or proportional variation in relation to altered degree of use or disuse . ADVERSE CASE OF NEUTER INSECTS . Mr. Spencer also holds that most mental phenomena , especially where complex ...
... illustrations show , no simultaneous or concomitant or proportional variation in relation to altered degree of use or disuse . ADVERSE CASE OF NEUTER INSECTS . Mr. Spencer also holds that most mental phenomena , especially where complex ...
Página 90
... illustration of atavism still resisting the effects of long - continued disuse . There is nothing to show that the inheritable portion of the full original thickness was not gained by natural selection rather than by the directly ...
... illustration of atavism still resisting the effects of long - continued disuse . There is nothing to show that the inheritable portion of the full original thickness was not gained by natural selection rather than by the directly ...
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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
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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.