Imagine a population where 20 individuals are aa, 40 are Aa, and 40 are AA. What are the allelic frequencies?
A) a = 0.2 and A = 0.8
B) a = 0.4 and A = 0.6
C) a = 0.5 and A = 0.5
D) a = 0.6 and A = 0.4

Question

Quizplus · Accepted Answer

To calculate allelic frequencies, count the total number of alleles and then the number of each allele. There are 100 individuals, so 200 alleles in total. For allele a: 20(aa) * 2 + 40(Aa) = 80 a alleles. For allele A: 40(AA) * 2 + 40(Aa) = 120 A alleles. Thus, frequency of a = 80/200 = 0.4 and frequency of A = 120/200 = 0.6.

Imagine a Population Where 20 Individuals Are Aa, 40 Are