Everything about Directional Selection totally explained
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 (for example even if the advantageous allele is recessive, it'll 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's directional selection in favor of the advantageous heterozygote. Directional selection is a particular mode or mechanism of natural selection.
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