Are the Effects of Use and Disuse Inherited?: An Examination of the View Held by Spencer and DarwinMacmillan, 1890 - 156 páginas |
Dentro del libro
Resultados 1-5 de 9
Página 27
... adapting it for its tasks . Seeing that natural selection can form and maintain the various structures and the exceedingly complicated instincts of ants and bees and wasps and termites in direct defiance of the alleged tendency to use ...
... adapting it for its tasks . Seeing that natural selection can form and maintain the various structures and the exceedingly complicated instincts of ants and bees and wasps and termites in direct defiance of the alleged tendency to use ...
Página 50
... of economy of material and adaptation of parts to changed conditions ? 2 Ibid . p . 180 . 1 Origin of Species , pp . 117 , 118 . The great principle of economy is continually at work shaping 50 ARE THE EFFECTS OF USE INHERITED ?
... of economy of material and adaptation of parts to changed conditions ? 2 Ibid . p . 180 . 1 Origin of Species , pp . 117 , 118 . The great principle of economy is continually at work shaping 50 ARE THE EFFECTS OF USE INHERITED ?
Página 51
... wings would keep the birds near the shelter and the food afforded by the island and its neighbourhood , and in some cases would become adapted to act as fins or flappers for swimming under water in pursuit E 2 REDUCED WINGS OF BIRDS . 51.
... wings would keep the birds near the shelter and the food afforded by the island and its neighbourhood , and in some cases would become adapted to act as fins or flappers for swimming under water in pursuit E 2 REDUCED WINGS OF BIRDS . 51.
Página 53
... adapted organisms in so severe and wholesale a fashion . Where enemies are absent there would be unrestrained multiplica- tion , and this would greatly increase the severity of the competition for food , and so hasten the elimination of ...
... adapted organisms in so severe and wholesale a fashion . Where enemies are absent there would be unrestrained multiplica- tion , and this would greatly increase the severity of the competition for food , and so hasten the elimination of ...
Página 84
... adapted and therefore most flourishing animals , while in disused parts panmixia or the comparative cessation of selection will aid or replace " economy of growth " in causing diminu- tion 84 ARE THE effects of USE INHERITED ?
... adapted and therefore most flourishing animals , while in disused parts panmixia or the comparative cessation of selection will aid or replace " economy of growth " in causing diminu- tion 84 ARE THE effects of USE INHERITED ?
Otras ediciones - Ver todas
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.