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Haldane's Dilemma, Evolutionary Rates, and Heterosis

Leigh Van Valen
The American Naturalist
Vol. 97, No. 894 (May - Jun., 1963), pp. 185-190
Stable URL: http://www.jstor.org/stable/2458906
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Haldane's Dilemma, Evolutionary Rates, and Heterosis
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Abstract

A solution to Haldane's dilemma (the cost to the population of natural selection) is provided by general adaptations and other changes that increase the mean population fitness. This permits rapid adaptive genetic change under some circumstances. A simple quantitative model of the genetic load due to heterosis is presented, and it is concluded that nonadditive interlocus interaction is the most probable means for preventing this load from being excessive.

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