Of 400 people who dwell on a Pacific island, 16 are homozygous recessive for a trait that has only two different types of alleles in the population.The number of heterozygous people is

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The frequency of the homozygous recessive genotype (q^2) is 16/400 = 0.04, so q = 0.2. The frequency of the dominant allele (p) is 1 - q = 0.8. The frequency of heterozygous individuals (2pq) is 2 * 0.8 * 0.2 = 0.32. Therefore, the number of heterozygous individuals is 0.32 * 400 = 128.

Of 400 People Who Dwell on a Pacific Island, 16