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In a population of 1000 individuals 360 belong to genotype AA, 480 to Aa and the remaining 160 to aa. Based on this data, the frequency of allele A in the population is:

1. 0.4
2. 0.5
3. 0.6
4. 0.7

Correct answer: 0.6

Solution

Allele frequency is based on total copies of the allele, not just genotype counts. Here, A appears in all AA individuals and once in each Aa individual, giving 1200 A alleles out of 2000 total alleles.

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