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词汇 Balancing selection
分类 英语词汇 英语翻译词典
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Balancing selection

英语百科

Balancing selection

Biston betularia morpha typica, the standard light-coloured Peppered Moth.
Biston betularia morpha carbonaria, the melanic Peppered Moth. The proportions of this form vary in different locations
Grove snail, dark yellow shell with single band.

Balancing selection refers to a number of selective processes by which multiple alleles (different versions of a gene) are actively maintained in the gene pool of a population at frequencies longer than for expected from genetic drift alone. This usually happens when the heterozygotes for the alleles under consideration have a higher adaptive value than the homozygote. In this way genetic polymorphism is conserved.

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