Why is it not enough to merely memorise 9:3:3:1 in a dihybrid cross?
Answer and explanation
Correct answer: Because it represents independent assortment of two traits and formation of new combinations
The ratio 9:3:3:1 is not an isolated number to recite. In the usual Mendelian dihybrid cross, it arises when two heterozygous parents produce gametes independently and the traits show complete dominance. The classes represent two parental-type and two new combinations in the F2 generation. Understanding this reasoning is more meaningful than memorising the ratio without its genetic basis.
Frequently asked questions
What is the correct answer to this question?
Because it represents independent assortment of two traits and formation of new combinations
Why is this the correct answer?
The ratio 9:3:3:1 is not an isolated number to recite. In the usual Mendelian dihybrid cross, it arises when two heterozygous parents produce gametes independently and the traits show complete dominance. The classes represent two parental-type and two new combinations in the F2 generation. Understanding this reasoning is more meaningful than memorising the ratio without its genetic basis.
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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