Approach to Hardy-Weinberg Proportions at sex-linked loci

For sex-linked loci, if allele frequencies in males and females are initially unequal, the frequency in males in generation n will be equal to that in females in the preceding generation n-1. The male f(a) therefore "chases" the female f(a) until they reach an equilibrium. Note that the equilibrium is reached in only a few generations, even when the initial frequencies are completely divergent