J.B.S. Haldane citations

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J.B.S. Haldane

Date de naissance: 5. novembre 1892
Date de décès: 1. décembre 1964

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John Burdon Sanderson Haldane est un généticien britannique, né le 5 novembre 1892 à Oxford et mort le 1er décembre 1964 à Bhubaneswar en Inde.

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Citations J.B.S. Haldane

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„If two animals have a common ancestor, their parasites are likely to be descended from those of the ancestor.“

— J. B. S. Haldane
Context: Comparative parasitology supports the evolutionary hypothesis. If two animals have a common ancestor, their parasites are likely to be descended from those of the ancestor. This principle has been applied with considerable effect to the classification of frogs and other groups. Introduction, p. 9.

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„Our ancestors were mostly rather rare creatures.“

— J. B. S. Haldane
Context: Wright's theory certainly supports the view taken in this book that the evolution in large random-mating populations, which is recorded by palaeontology, is not representative of evolution in general, and perhaps gives a false impression of the events occurring in less numerous species. It is a striking fact that none of the extinct species, which, from the abundance of their fossil remains, are well known to us, appear to have been in our own ancestral line. Our ancestors were mostly rather rare creatures. " Blessed are the meek : for they shall inherit the earth." Appendix, pp. 213-214.

„If much of the investigation here summarised has only proved the obvious, the obvious is worth proving when this can be done. And if the relative importance of selection and mutation is obvious, it has certainly not always been recognised as such.“

— J. B. S. Haldane
Context: Unaided common sense may indicate an equilibrium, but rarely, if ever, tells us whether it is stable. If much of the investigation here summarised has only proved the obvious, the obvious is worth proving when this can be done. And if the relative importance of selection and mutation is obvious, it has certainly not always been recognised as such. Appendix

„If human evolution is to continue along the same lines as in the past, it will probably involve a still greater prolongation of childhood and retardation of maturity. Some of the characters distinguishing adult man will be lost. It was not an embryologist or palaeontologist who said, "Except ye . . . become as little children, ye shall not enter into the kingdom of heaven."“

— J. B. S. Haldane
Context: If human evolution is to continue along the same lines as in the past, it will probably involve a still greater prolongation of childhood and retardation of maturity. Some of the characters distinguishing adult man will be lost. It was not an embryologist or palaeontologist who said, "Except ye... become as little children, ye shall not enter into the kingdom of heaven." Ch. V What is Fitness?, p. 150.

„Another possible mode of making rapid evolutionary jumps is by hybridisation.“

— J. B. S. Haldane
Context: Where natural selection slackens, new forms may arise which would not survive under more rigid competition, and many ultimately hardy combinations will thus have a chance of arising.... Thus the distinction between the principal mammalian orders seems to have arisen during an orgy of variation in the early Eocene which followed the doom of the great reptiles... Since that date mammalian evolution has been a slower affair, largely a progressive improvement of the types originally laid down in the Eocene. Another possible mode of making rapid evolutionary jumps is by hybridisation.... hybridisation (where the hybrids are fertile) usually causes an epidemic of variation in the second generation which may include new and valuable types which could not have arisen within a species by slower evolution. Ch. IV Natural Selection, pp. 104-106.

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