In a population of 1000 individuals 360 belong to genotype

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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 Option: C

According to Hardy Weinberg principle.
p² + 2pq + q² = 1; (p + q)² = 1
(AA) p² = 360 out of 1000 individual or p² = 36 out of 100.
q² = 160 out of 1000 or q² = 16 out of 100
so q = √.16 = .4, As p + q = 1
so p is 0.6.