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Flower colour in sweet pea shows duplicate epistasis, if purple colour is dominant what is the F2 ratio?

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Flower colour in sweet pea shows duplicate epistasis, if purple colour is dominant what is the F2 ratio?

(a) 15:1

(b) 9:7

(c) 3:1

(d) 9:3:4

This question was addressed to me in homework.

Question is from Duplicate Epistasis topic in section Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

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The correct choice is (b) 9:7

To explain: The F2 ratio in recessive duplicate epistasis as seen in case of sweet pea flower colour is 9:7. Where the ratio corresponds to purple(9): white(7) respectively.

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