A) a scientist cultures e. coli in the presence of a radioactive phosphate source. after growing the culture for 2 hours, she grinds up the e. coli and separates the bacterial dna from the proteins. which sample will contain most of the radioactivity and why?
b) the experiment is repeated, but this time, the bacteria are grown in the presence of radioactive sulfate instead of phosphate. which sample will contain the radioactivity and why?

The correct answer is c

Ther are many reasons.. is it a multiple choice?

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.