Using your understanding of Hardy-Weinberg proportions, which of the following statements is/are true? A. Population heterozygosity is highest when p = q = 0.5. B. If a population is not in Hardy-Weinberg proportions, the genotype frequencies will not add up to 1. C. Hardy-Weinberg frequencies refer to expected allele frequencies based on actual genotype frequencies. D. Rare alleles are found primarily in heterozygotes..