Two mutant genes in Drosophila melanogaster produce the recessive traits crossveinless wings (cv) and singed bristles (sn). Given the following genetic map, if the F1 dihybrid flies (produced from a cross of pure-breeding males with singed bristles and pure-breeding females with crossveinless wings) for these two genes were crossed to flies that expressed both recessive phenotypes, what outcome would you predict in terms of the phenotypic classes seen and numbers of progeny in each class (assume a population size of 1000)?
