Scientists think that oxygen produced by the first photosynthetic bacteria contributed to the creation of the ozone layer we have today. if the ozone layer blocked visible instead of uv radiant energy, what do you think would have happened to life on early earth? life on earth would have evolved more quickly due to mutations in the dna of early cells. the photosynthetic bacteria would have lost the radiant energy source they use to make chemical energy and would have died out. the photosynthetic bacteria would have turned to aerobic respiration for chemical energy production. photosynthetic bacteria on land would have depended on the higher energy uv light to make chemical energy instead.

B) The photosynthetic bacteria would have lost the radiant energy source they use to make chemical energy and would have died out.

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.