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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) 1:2:1:2:4:2:1:2:1This question was posed to me in final exam.My doubt is from Dihybrid Cross in division Mendelian Genetics of Cytogenetics

Answer»

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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