You Are a Lab Assistant Working with Drosophila

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