Question

In Drosophila, the gene for white (w) eyes is on the X chromosome and it is epistatic over brown and scarlet (both autosomal). White eyes can also result from crossing brown-eyed females (bw) with scarlet-eyed males (st) (that is, when both mutant alleles are present). A cross is made between white-eyed females with the genotype w/w (otherwise homozygous for wild type alleles) and white-eyed males hemizygous for the wild type allele (w+). F1 Generation: F1 Female = Xw+/Xw st+/st bw+/bw Phenotype is Wild Type Eyes F1 Male = Xw/Y st+/st bw/bw Phenotype is White Eyes What would the fraction of flies be for only white males, only brown females, wild type females, or scarlet males in the F2 Generation? Please show your work and thank you.

          In Drosophila, the gene for white (w) eyes is on the X chromosome and it is epistatic over brown and scarlet (both autosomal). White eyes can also result from crossing brown-eyed females (bw) with scarlet-eyed males (st) (that is, when both mutant alleles are present). A cross is made between white-eyed females with the genotype w/w (otherwise homozygous for wild type alleles) and white-eyed males hemizygous for the wild type allele (w+).

F1 Generation:
F1 Female = Xw+/Xw st+/st bw+/bw
Phenotype is Wild Type Eyes

F1 Male = Xw/Y st+/st bw/bw
Phenotype is White Eyes

What would the fraction of flies be for only white males, only brown females, wild type females, or scarlet males in the F2 Generation? Please show your work and thank you.

Added by Nancy M.

Question

Please give Ace some feedback