You are studying body color in an African spider and have found that it is controlled by a single gene with four alleles: B (brown), b^r (red), b^g (green), and b^y (yellow). B is dominant to all the other alleles, and b^y is recessive to all the other alleles. The b^g allele is dominant to b^y but recessive to b^r. You cross a pure-breeding brown spider with a pure-breeding green spider.
-Predict the genotype of the progeny.