Which of the following provides the best example of the parts of a system working together to achieve a specific function? A. Red blood cells are capable of transporting oxygen because of their chemical composition.
B. Glands in the mouth, the stomach, the pancreas, and the small intestine all secrete chemicals that break down nutrients.
C. Specialized cells in a plant's leaf open and close in response to changing conditions

What are the answers

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.