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), br (red), bg (green), and by (yellow). B is dominant to all the other alleles, and by is recessive to all the other alleles. The bg allele is dominant to by but recessive to br. You cross a pure-breeding brown spider with a pure-breeding green spider. -Predict the phenotype of the progeny.
A) half brown, half green B) three-fourths brown, one-fourth green C) all brown D) all green E) all yellow