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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.

Related tags

Dihybrid-RatioIndependent-AssortmentF2-GenerationHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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