“The change from one stable equilibrium to the other may take place as the result of the isolation of a small unrepresentative group of the population, a temporary change in the environment which alters the relative viability of different types, or in several other ways…”

—  J. B. S. Haldane, book The Causes of Evolution

Source: The Causes of Evolution (1932), Ch. IV Natural Selection, p. 102.

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J. B. S. Haldane32
Geneticist and evolutionary biologist 1892–1964

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