AP Biologymediummcq1 pt
A population is at Hardy–Weinberg equilibrium for a gene with two alleles, and 49% of individuals show the recessive phenotype. What is the frequency of the dominant allele?
A.0.7
B.0.3
C.0.49
D.0.51
Explanation
Core Concept
At Hardy–Weinberg equilibrium, the recessive phenotype frequency is q². If q²=0.49, then q=0.70 and the other allele has frequency p=1−q=0.30. The equilibrium assumption is necessary before inferring allele frequency from phenotype frequency.
Correct Answer
B0.3
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