This simulation illustrates the interaction of drift, segregation distortion, and natural selection. The distortion ratio determines the frequency of the t-allele in sperm of heterozygous males (None = 50%, +0.1 = 60%, +0.3 = 80%, +0.45 = 95%). Homozygous genotypes of both sexes are assumed to be lethal, but there is no other selection (cf. Lewontin and Dunn paper Genetics 45:705-722; 1960).
The horizontal axis shows the frequency of the t-allele. It is divided into ten intervals (0-0.1, 0.1-0.2, etc.). The height of each bar corresponds to the number of populations with an allele frequency in that interval. The vertical red line shows the equilibrium frequency expected in an infinite population.