Glossopteris was a fern that existed in a warm tropical climate environment 200 million years ago. Fossils of this plant have been found in what are now India, Antarctica, Australia, and Madagascar. What does this tell you about the location of Gondwanaland (the larger continent that existed millions of years ago)? A. Gondwanaland experienced extreme changes in temperature.
B. Gondwanaland must have existed near the equator.
C. Gondwanaland must have been a desert.

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.