In Drosophila , production of eye color pigment requires a functional protein en

Question

In Drosophila, production of eye color pigment requires a functional protein encoded by the white locus. Flies with two copies of the w allele lack any eye color pigment; flies with at least one wild-type w+ allele have pigment. The bw allele at the brown locus produces a defective enzyme responsible for converting one type of pigment to another. Flies with two bw alleles have brown eyes, where those with at least one wild-type bw+ allele 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. bw and w are codominant.

d. The white locus is epistatic to the brown locus.

e. The brown locus is epistatic to the white locus.

In Drosophila, production of eye color pigment requires a functional protein encoded by the white locus. Flies with two copies of the w allele lack any eye color pigment; flies with at least one wild-type w+ allele have pigment. The bw allele at the brown locus produces a defective enzyme responsible for converting one type of pigment to another. Flies with two bw alleles have brown eyes, where those with at least one wild-type bw+ allele 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. bw and w are codominant.

d. The white locus is epistatic to the brown locus.

e. The brown locus is epistatic to the white locus.

Explanation / Answer

The brown locus is epistatic to white color locus

Note - epistasis is when presence of one gene determine the functioning of the another gene and the efftectvof it is dependent on other gene presence.

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