In radishes, flower color can be red, purple or white. The allele for long (O) tuber shape is completely dominant over oval (o). With regard to flower a cross between red and white resulted in purple F1 progeny. When the F1 plants were self-pollinated a phenotypic ration of 1 red: 2purple: 1 white was observed. Determine the F1 and F2 phenotypes from a cross between pure-breeding red long radish and one that pure breeding white oval shaped.

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. 

Carbon dioxide is the correct answer

Carbon monoxide is the answer: )