In the second generation of a dihybrid cross, what does the 9:3:3:1 ratio indicate?
Answer and explanation
Correct answer: Independent assortment of two traits
The 9:3:3:1 phenotypic ratio is characteristic of the F2 generation of a Mendelian dihybrid cross when the two pairs of alleles assort independently and complete dominance occurs. The four classes represent two parental combinations and two recombinant combinations. Therefore, option A is correct. Option B describes a monohybrid situation, while options C and D are unrelated to this ratio.
Frequently asked questions
What is the correct answer to this question?
Independent assortment of two traits
Why is this the correct answer?
The 9:3:3:1 phenotypic ratio is characteristic of the F2 generation of a Mendelian dihybrid cross when the two pairs of alleles assort independently and complete dominance occurs. The four classes represent two parental combinations and two recombinant combinations. Therefore, option A is correct. Option B describes a monohybrid situation, while options C and D are unrelated to this ratio.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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