Consider a Biochemical Pathway in Petal Cells of a Plant

Short Answer

Consider a biochemical pathway in petal cells of a plant, in which a white precursor is turned into a final red pigment through a yellow and an orange intermediate by the activity of three enzymes encoded by genes A, B, and C. The petal color in plants harboring functional (capital letter) or nonfunctional (lowercase letter) alleles of these genes is presented in the following table. What do you think is the order in which the enzymes act in the pathway? Your answer would be a three-letter string composed of letters A to C, e.g. BCA.