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In population genetics, directional selection occurs when natural selection favors a single phenotype and therefore allele frequency continuously shifts in one direction. Under directional selection, the advantageous allele will increase in frequency independently of its dominance relative to other alleles (i.e. even if the advantageous allele is recessive, it will eventually become fixed). Directional selection stands in contrast to balancing selection where selection may favor multiple alleles, and is the same as purifying selection which removes deleterious mutations from a population, in other words it is directional selection in favor of the advantageous heterozygote. Directional selection is a particular mode or mechanism of natural selection.
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|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Directional_selection". A list of authors is available in Wikipedia.|