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Wahlund effect
Effect in population genetics / From Wikipedia, the free encyclopedia
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In population genetics, the Wahlund effect is a reduction of heterozygosity (that is when an organism has two different alleles at a locus) in a population caused by subpopulation structure. Namely, if two or more subpopulations are in a Hardy–Weinberg equilibrium but have different allele frequencies, the overall heterozygosity is reduced compared to if the whole population was in equilibrium. The underlying causes of this population subdivision could be geographic barriers to gene flow followed by genetic drift in the subpopulations.
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The Wahlund effect was first described by the Swedish geneticist Sten Wahlund in 1928.[1]