A fly has two alleles for the color of its eyes. The green allele is recessive, and is represented by q. The blue allele is dominant, and is represented by p. If 11 of 100 organisms are green, what is q?
~.33. This is because p^2 + 2(pq) + q^2 = 1 and p + q = 1. 11% of the population is green (which equals q^2) so take the square root and you will get ~.33.
