How to calculate initial frequency of q only given the frequency of p and population size.

The first thing you'll need to do is obtain p and q. So, since white is recessive (i.e. bb), and 40% of the butterflies are white, then bb = q 2 = 0.4. To determine q, which is the frequency of the recessive allele in the population, simply take the square root of q 2 which works out to be 0.632 (i.e. 0.632 x 0.632 = 0.4). So, q = 0.63.

Explanation:

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