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If 9 percent of a population at equilibrium shows a recessive trait, carriers make up:
A0.21
B0.09
C0.42
D0.49
Answer & Solution
Correct answer: C. 0.42
q^2 = 0.09 gives q = 0.3 and p = 0.7, so carriers 2pq = 2 x 0.7 x 0.3 = 0.42.
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