The correlation between relatives under assortative malting for an X-linked and autosomal trait.

Correlations between various relatives are derived for phenotypic assortative mating at equilibrium for a trait determined by additive autosomal and X-linked loci without dominance, with proportional gene effects in the two sexes, and with an uncorrelated environment. It is assumed that genotype and environment are normally distributed, that phenotypes of mates are bivariate-normally distributed, and that regression of an individual's phenotype or genotype on the phenotype or genotype of any of his relatives is linear.