In a population at Hardy-Weinberg equilibrium, a recessive phenotype occurs in 9 percent of individuals. What is the expected frequency of heterozygous carriers?
Correct answer: C. 42 percent
- A. 21 percent
- B. 30 percent
- C. 42 percent
- D. 49 percent
Explanation
The recessive phenotype frequency is q² = 0.09, so q = 0.3 and p = 0.7. The carrier frequency is 2pq = 2 × 0.7 × 0.3 = 0.42, or 42 percent.
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Covers genes, chromosomes, inheritance, genetic variation, mutations, heritability and quantitative traits in livestock. It also includes selection methods, breeding systems, inbreeding, crossbreeding, heterosis and evaluation of traits such as growth, milk yield, fertility and disease resistance.
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