# Genetics homework problem. I got 45 and 60 but it keeps saying its wrong.?

A population of 1000 individuals is determined to have these genotypes at the A locus: 400 AA, 400 Aa, and 200 aa. What are the frequencies of the A and a alleles (values of p and q), in this population?

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- SmegheadLv 79 months ago
One of the fundamental rules is that p + q = 1, so there's one big hint that the answers aren't 45 and 60.

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- JazSincLv 79 months ago
Count alleles.

You have 1000 individuals. You have 2000 alleles total.

You have

A alleles: 400 + 400 + 400 = 1200 A alleles

a alleles: 400 + 200 + 200 = 800 a alleles

Let p = freq(A) = 1200/2000 = 0.6 (answer)

Let q = freq(a) = 800/2000 = 0.4 (answer)

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