Balancing selection

（重定向自Balanced polymorphism）

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.

单词	Balanced polymorphism
释义	Balanced polymorphism 英语百科 Balancing selection （重定向自Balanced polymorphism） 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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