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 4
... kind , and in his Factors of Organic Evolution1 he has supported his contention with a selection of facts and reason- ings which I shall have the temerity to examine and criticize . Darwin also held the same view , though not so ...
... kind , and in his Factors of Organic Evolution1 he has supported his contention with a selection of facts and reason- ings which I shall have the temerity to examine and criticize . Darwin also held the same view , though not so ...
Página 21
... kind . " While co- operative parts would often be more or less correlated , so that they would tend to vary to- gether , coincident variation is not necessary . The lengthened wing might be gained in one genera- tion , and the ...
... kind . " While co- operative parts would often be more or less correlated , so that they would tend to vary to- gether , coincident variation is not necessary . The lengthened wing might be gained in one genera- tion , and the ...
Página 23
... kind . Having a name for a thing is highly convenient ; it facilitates clearness and accuracy in reasoning , and in this particular inquiry it may save some confusion of thought from double or incomplete meanings in the shortened ...
... kind . Having a name for a thing is highly convenient ; it facilitates clearness and accuracy in reasoning , and in this particular inquiry it may save some confusion of thought from double or incomplete meanings in the shortened ...
Página 26
... kind of neuter is three times the size of the other , 1 Origin of Species , pp . 230-232 ; Bates's Naturalist on the Amazons . Darwin is " surprised that no one has hitherto advanced the demonstrative case of neuter insects , against ...
... kind of neuter is three times the size of the other , 1 Origin of Species , pp . 230-232 ; Bates's Naturalist on the Amazons . Darwin is " surprised that no one has hitherto advanced the demonstrative case of neuter insects , against ...
Página 35
... kind strike one as peculiar exceptions rather than as examples of a general rule or law . They seem to show that certain morbid conditions may occasionally affect both the individual and the reproductive elements or transmissible type ...
... kind strike one as peculiar exceptions rather than as examples of a general rule or law . They seem to show that certain morbid conditions may occasionally affect both the individual and the reproductive elements or transmissible type ...
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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.