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Increase in frequency of an allele due to that allele's beneficial impact on the fitness of carriers.
See also Clonal expansion.
In selective sweeps with clonal organisms not only does the beneficial allele sweep the population (potentially to fixation) but so too do all of the alleles – neutral, beneficial, or even detrimental – to which the beneficial allele is linked. The latter, for these other alleles, is a process known as hitchhiking.
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