A) a moth has two alleles for spots. it can have brown or white spots. the brown spot allele frequency is 0.26. what is the white spot allele frequency?

The answer is 0.74.

This is derived using the Hardy Weinburg principle of allelic frequency at equilibrium.

p + q = 1

Therefore if q = 0.26; then 1 - 0.26 = 0.74

In most occasions, the allele with the higher frequency is usually the dominant one (but not always).