The presence of freckles is due to a dominant allele. Four percent of the individuals in a particular population lack freckles. Use the Hardy-Weinberg formula to calculate the percentage of individuals in this population who are homozygous dominant for freckles.
A)32%
B)4%
C)64%
D)80%

Question

Quizplus · Accepted Answer

The Hardy-Weinberg formula states that the frequency of homozygous dominant individuals in a population is equal to the square of the frequency of the dominant allele. In this case, the frequency of individuals who lack freckles is 4%, which means that the frequency of the recessive allele is 0.2. Therefore, the frequency of the dominant allele is 1 - 0.2 = 0.8. The frequency of homozygous dominant individuals is therefore 0.8^2 = 0.64, or 64%.

The Presence of Freckles Is Due to a Dominant Allele