In a population at Hardy-Weinberg equilibrium, 9% of people show a recessive trait. What percentage show the dominant phenotype?
Correct answer D. 91%
Explanation
Dominant phenotype includes AA and Aa, so its frequency is 1 − q² = 1 − 0.09 = 0.91, i.e. 91%. 49% is p² only and 42% is 2pq only.
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