Pea plants have two traits: round or wrinkled seeds, and tall or short stems.

Round and tall are dominant, while wrinkled and short are recessive.

Two parent plants are crossed. One is heterozygous for both traits, the other is homozygous dominant for seed shape, and homozygous recessive for stem height.

What are the genotypes of the two parent plants? Use R or r for seed shape, and T or t for stem height.

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. 

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