In some plants a red pigment is synthesized from a colorlessprecursor by a single enzyme coded for by gene A. The red pigmentcan be changed into a purple pigment by another enzyme coded for bygene B. A cross between pure-breeding purple plants and whiteplants with the resulting F2:
94 purple
31 red
43 white
A. Give a concise genetic hypothesis for inheritance of flowercolor from these results (include number of genes, number ofalleles, and the relations between genes and alleles).
B. Using symbols A and B to correspond to genes A and B asdescribed above symbolize the genotypes and their ratios for eachF2 phenotypic class.
C. If the F1 is used in a testcross, what phenotypicratio would you expect in the progeny?
