Assume the trait for brown eyes is completely dominant to blue eyes and this trait is controlled by a single gene.If 400 people in a population of 10,000 have blue eyes,how many people would be expected to be heterozygous for this trait? (Hint: Use the Hardy-Weinberg formula.)

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Quizplus · Accepted Answer

According to the Hardy-Weinberg principle, q^2 represents the frequency of the homozygous recessive genotype (blue eyes). Given q^2 = 400/10,000 = 0.04, q = 0.2. Therefore, p = 1 - q = 0.8. The frequency of heterozygotes (2pq) is 2 * 0.8 * 0.2 = 0.32. Thus, 0.32 * 10,000 = 3,200 people are expected to be heterozygous.

Assume the Trait for Brown Eyes Is Completely Dominant to Blue