In Drosophila the brown eye mutant allele (bw) is autosomal and is recessive to the wild type allele (bw+). True breeding wild type flies are crossed to true breeding brown eyed flies.

a) What is the genotype and the phenotype of the F1 flies?

b) If the F1 flies are intercrossed, what is the genotypic and phenotypic ratio of the F2 flies? Use a Punnett square to answer if needed.