In a population at Hardy-Weinberg equilibrium, 75% of individuals show the dominant phenotype. What is the frequency of the recessive allele?
Correct answer A. 0.5
Explanation
Recessive phenotype frequency q² = 1 − 0.75 = 0.25. Therefore q = √0.25 = 0.5. Using 0.25 directly confuses q² with q.
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