Question

In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of the allele a is 0.7. What is the percentage of the population that is heterozygous for this allele?a. 3b. 9c. 30d. 42e. 49

Answer 1

The percentage of the population that is heterozygous for this allele is 42%.

Step-by-step explanation:

In a Hardy-Weinberg population, where allelic frequencies are p and q, genotypic frequencies after one generation of random matings are p², 2pq and q². The allelic frequencies, as well as the genotypic frequencies, remain equal after successive generations.

In the exposed example, the allelic frequency for A is 0,3, while the allelic frequency for a is 0,7. The population heterozygote frequency for this allele is 2xpxq = 2 x 0,3 x 0,7 = 0.42. The percentage of the population that is heterozygous for this allele is 42%.