The plasmid described in the previous question is digested with HindIII, and BamHI, and separated by gel electrophoresis. The bands are then blotted onto a membrane and hybridized with a radioactively labeled probe, made by using the 4kb fragment from the EcoR1 digest. Which band(s) will be detected in this Southern blot?

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. 

It's definitely not b or c, it's either a or d but i can't figure out which one sorey