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Principles of Inheritance and Variation
Dihybrid Cross and Law of Independent Assortment
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Concepts tested
- Mendelian Dihybrid Ratio
All Questions
2025 1 question
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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?
A standard Mendelian dihybrid cross with independent assortment yields a 9:3:3:1 phenotypic ratio in F2.
Crossing homozygous parents $RRYY \times rryy$ gives dihybrid $RrYy$ in $F_1$. Self-fertilization of $F_1$ yields 16 combinations in $F_2$ with the classic 9:3:3:1 ratio (9 Round Yellow, 3 Round Green, 3 Wrinkled Yellow, 1 Wrinkled Green).