Answer:
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: