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The Effect of Variation on Fitness

J. B. S. Haldane
The American Naturalist
Vol. 71, No. 735 (Jul. - Aug., 1937), pp. 337-349
Stable URL: http://www.jstor.org/stable/2457289
Page Count: 13
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The Effect of Variation on Fitness
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Abstract

In a species in equilibrium variation is mainly due to two causes. Some deleterious genes are being weeded out by selection at the same rate as they are produced by mutation. Others are preserved because the heterozygous form is fitter than either homozygote. In the former case the loss of fitness in the species is roughly equal to the sum of all mutation rates and is probably of the order of 5 per cent. It is suggested that this loss of fitness is the price paid by a species for its capacity for further evolution.

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