You Are a Lab Assistant Working with Drosophila

question 79

Multiple Choice

You are a lab assistant working with Drosophila.You suspect that vestigial-winged flies may have contaminated a vial of wild-type flies.You know that vestigial wings are recessive to the wild type.The best way to tell whether a male fly with normal wings taken from the questionable vial is homozygous wild type is to mate it to females that you know are _______.The male is homozygous wild type if _______.

• A) homozygous for vestigial wings; all the offspring have wild-type wings
• B) homozygous for vestigial wings; all the offspring have vestigial wings
• C) heterozygous; all the offspring are wild type
• D) homozygous for wild-type wings; all the offspring have wild-type wings
• E) homozygous for vestigial wings; half the offspring have wild-type wings and half have vestigial wings

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