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A selective sweep describes the reduction of linked genetic variation due tostrong positive selection. If s is the fitness advantage of a homozygote forthe beneficial allele and h its dominance coefficient, it is usually assumedthat h=1/2, i.e. the beneficial allele is co-dominant. We complement existingtheory for selective sweeps by assuming that h is any value in [0,1]. We showthat genetic diversity patters under selective sweeps with strength s anddominance 0<h<1 are similar to co-dominant sweeps with selection strength 2hs.Moreover, we focus on the case h=0 of a completely recessive beneficial allele.We find that the length of the sweep, i.e. the time from occurrence untilfixation of the beneficial allele, is of the order of sqrt(N/s) generations, ifN is the population size. Simulations as well as our results show that geneticdiversity patterns in the recessive case h=0 greatly differ from all othercases.

Selective sweeps for recessive alleles and for other modes of dominance