question about applying the Hardy Weinburg theorem?

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lupenliveson

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A sample of butterflies contained 50% yellow-winged individuals and 50% black-winged individuals. In this species, wing color is determined by a single gene with two alleles, and the allele for black is dominant. Assume that this population is in a Hardy-Weinburg equilibrium. Also assume that the sample is random and large enough that the allele frequencies in the sample equal the allele frequencies in the entire population. What is the frequency of the allele for yellow wings in the population?

using: q2 + 2pq + q2 =1

I got .25, bu then I remembered that I forgot to add the middle section (.25) so I got: .5. Is .5 correct?
 
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