Assortative mating, linkage and genotypic frequencies

The effect of introducing assortative mating in a population in linkage equilibrium is considered. It is shown that the introduction of assortative mating will disturb linkage equilibrium which will be re-established at another point independent of the recombination value r but depending upon additive variance and gene frequencies. It is also shown that when equilibrium is established Fisher's (1918) model of assortative mating will be applicable.