(3 points): You cross a purebreeding yellow-eyed male fly with a purebreeding red-eyed female fly. The resulting offspring are red.

(3 points): You cross a purebreeding yellow-eyed male fly with a purebreeding red-eyedfemale fly. The resulting offspring are red. When you cross F1 males back to a pure-breedingyellow female, you get yellow males, while when you cross F1 males back to pure-breeding redfemale you get red males.(a) What simple model accounts for this?(b) Given your model from (a) what are the expected eye colors (and their frequencies)in the F1 when the purebreeding yellow fly is a male and the purebreeding red fly afemale?(c) Now suppose the sexes are switched, so that the male is purebreeding red and thefemale purebreeding yellow.