Genetic hitchhikingalso called genetic draft or the hitchhiking effect is when an allele changes frequency not because it itself is under natural selectionbut because it is near another gene that is undergoing a selective sweep and that is on the same DNA chain. When one gene goes through a selective sweep, any other nearby polymorphisms that are in linkage disequilibrium will tend to change their allele frequencies too. Neutral or even slightly deleterious alleles that happen to be close by on the chromosome 'hitchhike' along with the sweep.
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