HINT 15E: You need to find the expected proportion of heterozygotes formed by random mating within a population with allele frequency *p*, E[2*pq*]. This is derived in Box 15.1 as 2(*p*_{0}*q*_{0} – var(*p*)) = 2*p*_{0}*q*_{0}(1– 1/2*N*)^{t}). If two individuals randomly chosen from different subpopulations were crossed, what would be the chance that their offspring would be heterozygous?