two mutations of the lacI (repressor) gene have different effects. The IW mutation results in constant beta-galactosidase and permease production, even in the absence of lactose. The IS mutation prevents any production of these enzymes, even in the presence of lactose. Provide a possible explanation for the different effects of these two mutations on the repressor protein molecule

The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait. 

The correct answer is d. i'm 85% sure