In Drosophila, Production of Eye Color Pigment Requires a Functional

question 119

Multiple Choice

In Drosophila, production of eye color pigment requires a functional protein encoded by the white locus.Individuals with two copies of the w allele lack any eye color pigment; individuals with at least one wild-type allele have pigment.The bw allele at the brown locus produces a defective enzyme responsible for converting one type of pigment to another.Individuals with two bw alleles have brown eyes; individuals with at least one wild-type allele at the brown locus have normal red eyes (assuming that they have eye pigment) .Which statement is true?

• A) bw is dominant to w.
• B) w is dominant to bw.
• C) The white locus is epistatic to (affects the expression of) the brown locus.
• D) The brown locus is epistatic to (affects the expression of) the white locus.
• E) bw and w are codominant.

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