In a series of experiments, avery treated heat-killed nonvirulent s bacteria with enzymes that degraded the proteins, dna, and rna of the s bacteria, then mixed this with nonvirulent r bacteria. s cells grew in all cases except the samples with degraded dna. what did this demonstrate?

a. protein, dna, and rna from the s bacteria are all necessary for bacterial transformation to occur.
b. dna from the s bacteria is necessary for bacterial transformation to occur.
c. rna from the s bacteria is necessary for bacterial transformation to occur.
d. protein from the s bacteria is necessary for bacterial transformation to occur.

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. 

There would be no evaporation so no water cycle