Apterous cross Apterous is an autosomal recessive gene. gene symbols               A         for the gene for normal wing size                       a          for no wings (apterous) The parents were AA males crossed with aa females Diagram of P1 cross: You are crossing Aa with Aa. Diagram of F1 cross: Give expected F2 phenotypic ratio: Give expected F2 genotypic ratio:

Ithink it’s b but not 100% sure

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.