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 3
... whole . If acquired modifications are impressed on the offspring and on the race , the systematic moral training of individuals will in time produce a constitutionally moral race , and we may hope to improve mankind even in defiance of ...
... whole . If acquired modifications are impressed on the offspring and on the race , the systematic moral training of individuals will in time produce a constitutionally moral race , and we may hope to improve mankind even in defiance of ...
Página 12
... whole , we must conclude that the human jaws do not afford satisfactory proof of the inheritance of the effects of use and disuse , inasmuch as the differences in their weight and shape and size can be more reasonably and con- sistently ...
... whole , we must conclude that the human jaws do not afford satisfactory proof of the inheritance of the effects of use and disuse , inasmuch as the differences in their weight and shape and size can be more reasonably and con- sistently ...
Página 13
... whole biting apparatus - weakness of the parts concerned favouring harmlessness . Mr. Spencer maintains that the dwindling of the parts concerned in clenching the jaw is certainly not due to artificial selection because the modifica ...
... whole biting apparatus - weakness of the parts concerned favouring harmlessness . Mr. Spencer maintains that the dwindling of the parts concerned in clenching the jaw is certainly not due to artificial selection because the modifica ...
Página 28
... Whole communities of bees sometimes take to theft , and live by plundering hives , first killing the queen to create dismay among the workers . Slave ants attend devotedly to their captors , and fight against their own species . Forel ...
... Whole communities of bees sometimes take to theft , and live by plundering hives , first killing the queen to create dismay among the workers . Slave ants attend devotedly to their captors , and fight against their own species . Forel ...
Página 42
... whole organization is rendered in some degree plastic " ( Descent of Man , p . 30 ) . It also appears that " the nature of the conditions is of subordinate importance in comparison with the nature of the or- ganism in determining each ...
... whole organization is rendered in some degree plastic " ( Descent of Man , p . 30 ) . It also appears that " the nature of the conditions is of subordinate importance in comparison with the nature of the or- ganism in determining each ...
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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.