As the modern horse evolved from its ancestors due to changes in feeding habits, substantial changes occurred in the shape of its teeth. what kind of change in feeding habit is reflected by these modifications? a)the ancestors grazed on soft forest leaves, and modern horses graze on hard grasses. b)the ancestors grazed on hard grasses, and modern horses graze on soft forest leaves. c)the ancestors grazed on leaves of tall trees, and modern horses graze on hard grasses.

A)The ancestors grazed on soft forest leaves, and modern horses grazed on hard grasses.

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.