Consider the model of temperature regulation in humans. instead of an increase in temperature, as seen here, imagine that the human body temperature drops. how would this model most likely change in response to a drop in temperature? a) signals from the hypothalamus would stop. b) the blood vessels move up and down in the skin. c) vasodilation would be replaced by vasoconstriction. d) the vasodilation step in the model would include shivering.

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. 

The category is the thing that is most simmilar throughout a period