Question:

Genes R and Y follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?

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Dihybrid cross = 9:3:3:1.
Updated On: May 4, 2025
  • Phenotypic ratio – 3:1
  • Phenotypic ratio – 9:3:3:1
  • Phenotypic ratio – 9:7
  • Phenotypic ratio – 1:2:1
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The Correct Option is B

Solution and Explanation

This is a classic dihybrid cross. Independent assortment of two genes with dominant/recessive alleles (R/r and Y/y) results in a 9:3:3:1 phenotypic ratio in the F2 generation: 9: Round, Yellow (R\_Y\_)
3: Round, Green (R\_yy)
3: Wrinkled, Yellow (rrY\_)
1: Wrinkled, Green (rryy)
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