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The expected phenotypic ratio obtained by crossing the F1 generation in dihybrid cross would be?

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The expected phenotypic ratio obtained by crossing the F1 generation in dihybrid cross would be?

(a) 3:1

(b) 1:2:1

(c) 9:3:3:1

(d) 1:2:1:2:4:2:1:2:1

This question was posed to me in final exam.

My doubt is from Dihybrid Cross in division Mendelian Genetics of Cytogenetics

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The correct option is (c) 9:3:3:1

Easiest explanation: The phenotypic ratio obtained by the dihybrid cross is 9:3:3:1 while that by a monohybrid cross is 3:1. The genotypic ratio of a monohybrid cross is 1:2:1 while the genotypic ratio of dihybrid cross would be 1:2:1:2:4:2:1:2:1.

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