Normal Fruit Flies Have Red Eyes

question 79

Multiple Choice

Normal fruit flies have red eyes.Flies with mutations that block the function of the X-linked white gene have white eyes.The wild-type allele is completely dominant to mutant alleles.A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the following types of progeny?

• A)red-eyed females and white-eyed males
• B)white-eyed females and red-eyed males
• C)all red-eyed females and a 50:50 mixture of white-eyed and red-eyed males
• D)all red-eyed males and a 50:50 mixture of white-eyed and red-eyed females
• E)The result cannot be predicted because it depends on whether the female is homozygous or heterozygous.

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