Question

6. We will say that the gene that controls enzyme 4 is symbolized by set in its dominant form (wild type) and se in its recessive form. The recessive allele, se, thus codes for a non-functional enzyme product. Can an individual that is se se or se se produce the orange pigment drosopterin? If so, what will be the fly's phenotype regarding eye colour? (2)

Answer 1

6.No.An individual with se⁺se⁺ or se⁺se cannot produce orange pigment drosopterin.Because orange eyecolour is a recessive trait.The recessive effect of se is masked by the dominant effect of se⁺.Eye colour in drosophilla is a sex linked trait.In female drosophilla, eye colour is orange only if both the alleles are X^seX^se.

8.female flies with X^w+X^w+ produces red pigment because red pigment is the dominant trait.(wild type).In female flies with X^w+X^w also produces red pigment because the effect of recessive allele X^w is masked by the dominant effect of X^w+.

9.the phenotype will be white eye.Because white eye is a recessive trait,so this will be exoressed in females when the both the alleles are recessive.