Question 9

(Multiple Choice)

Genetic experiments by Thomas Hunt Morgan and colleagues examined eye color in Drosophila fruit flies. Males are XY and females are XX, and the gene responsible for eye color is on the X chromosome. Red eye color (wild-type) is dominant to white eye color (mutant). The wild type allele is denoted Xw+ and the mutant allele is Xw. Which of the statements about eye color in these fruit flies is true?


A) Half of male flies with Xw have white eyes
B) All female flies with Xw have white eyes
C) Red-eye females can only produce red-eye offspring
D) A cross between red-eye males and red-eye females can produce white-eye males

Answer