In Drosophila , production of eye color pigment requires a functional protein en
ID: 3166068 • Letter: I
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.