If two genes are involved in the same pathway, you must inherit at least one dom

Question

If two genes are involved in the same pathway, you must inherit at least one dominant copy of each gene in order to complete the pathway and produce the final pigment. This is observed in anthocyanin production in sweet peas, resulting in the flowers either being purple (pigment produced) or white (pigment missing). What ratio would you expect to observe if these two genes exhibit complementary gene epistasis?

A) 12 purple : 4 white

B) 13 purple : 1 white

C) 12 white : 4 purple

D) 9 purple : 7 white

E)9 white : 7 purple

Explanation / Answer

D) 9 purple : 7 white

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