Commensalism: The Remora Fish feeds off the food scraps from the shark When one organism benefits, and the other isn’t helped or harmed (, ) The remora has a suction cup on the top of its head to attach to the shark. It eats the excess food that the shark doesn’t eat and also gets a free ride (using no energy of its own for movement).
Does the remora cause any harm to the shark?
Does the shark benefit from the remora in any way?

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.