How do eukaryotic cells differ from each other?

Unlike Prokaryotic cells, eukaryotic cells can actually have different roles instead of the same cell over and over.  This, obviously, leads to more complex creatures.  Basically, a theory (now proven correct) called The Big Gulp explains how we took in small prokaryotic organisms to do the roles for us.  For example, mitochondria makes proteins so we do not have to waste our own organisms protein.

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.