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 10
... seems extremely improbable . The heavier skull and narrower molar teeth point however to other factors than increased use . The striking variability of the human jaw is strongly opposed 10 ARE THE EFFECTS OF USE INHERITED ?
... seems extremely improbable . The heavier skull and narrower molar teeth point however to other factors than increased use . The striking variability of the human jaw is strongly opposed 10 ARE THE EFFECTS OF USE INHERITED ?
Página 24
... seems hardly feasible , seeing that natural selection must continually favour the most workable consti- tutions , and will only preserve organisms in pro- portion as they combine general workableness with the special modification . On ...
... seems hardly feasible , seeing that natural selection must continually favour the most workable consti- tutions , and will only preserve organisms in pro- portion as they combine general workableness with the special modification . On ...
Página 28
... seem to be capable of altering their habits and methods of action much as men do . Bees taken to Australia cease to store honey after a few years ' experience of the mild winters . Whole communities of bees sometimes take to theft , and ...
... seem to be capable of altering their habits and methods of action much as men do . Bees taken to Australia cease to store honey after a few years ' experience of the mild winters . Whole communities of bees sometimes take to theft , and ...
Página 30
... seems to be , must have been a latent and indirect consequence of the development of the sense of hearing and of melody . Use , at least , could never have called it into existence . Nature favours and develops enjoyments to a certain ...
... seems to be , must have been a latent and indirect consequence of the development of the sense of hearing and of melody . Use , at least , could never have called it into existence . Nature favours and develops enjoyments to a certain ...
Página 35
... seem to show that certain morbid conditions may occasionally affect both the individual and the reproductive elements or transmissible type in a similar manner ; but then we also know that such prompt and complete transmission of an ...
... seem to show that certain morbid conditions may occasionally affect both the individual and the reproductive elements or transmissible type in a similar manner ; but then we also know that such prompt and complete transmission of an ...
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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.