Topic: Mendelian inheritance· Genetics and Evolution

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?

1. Phenotypic ratio - 1 : 2 : 1

2. Phenotypic ratio - 3 : 1

3. Phenotypic ratio - 9 : 3 : 3 : 1

4. Phenotypic ratio - 9 : 7

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Answer: 3. Phenotypic ratio - 9 : 3 : 3 : 1

Key idea: This is a standard dihybrid cross.

RRYY x rryy gives F1 RrYy (all round yellow). Selfing F1 with independent assortment gives F2 phenotypes round yellow : round green : wrinkled yellow : wrinkled green = 9 : 3 : 3 : 1. Option 3.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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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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