Question

All one question

39. The followi ng is the eye pigmentation pathway in Drosophila. When all genes are normal oted as WT or +) dark red color es an enzyme which produces brown ommochrome pigment an enzyme which produces brown ommochrome pigment and not mutated the result in the normal (den cinnabar (c) encod scarlet (s) encodes brown (b) encodes for a protein important in bright red p white (w)encodes a protein important in pigment transport ation to the eyes Colorless cinnabar scarlet compound Ommochrome white Transport |-> System pigment Dark Red Colorless ompound →| Yellow Drosopterin protein Blue- brown pntx A cross is performed between two flies with genotype c+c , w+w and c+c , ww. a. What are the eye colors of the parents being crossed?

Answer 1

b. Crossing of

Dark Red (C⁺C, W⁺W)

Brown (C⁺C, WW)

Dark Red	Brown
Dark Red	Brown

The probability of Dark eye is 4/2 = 50%

The probability of the Brown eye is 4/2 + 50%

c. The gene C⁺C, WW to be mutated to result in flies with brown eyes