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What is the significance of the nine to three to three to one ratio in the second generation of a dihybrid cross?

Answer and explanation

Correct answer: It shows independent assortment

A dihybrid cross follows two pairs of contrasting traits at the same time. When the allele pairs assort independently, a cross such as AaBb × AaBb produces the F2 phenotypic ratio 9:3:3:1: nine with both dominant traits, three with the first dominant and second recessive, three with the first recessive and second dominant, and one with both recessive. Thus C is correct; the ratio does not prove acquired inheritance, linkage, or only sex determination.

Related tags

Dihybrid CrossIndependent AssortmentMendelF2 RatioHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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