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In a dihybrid cross, what idea is supported by the 9:3:3:1 result?

Answer and explanation

Correct answer: Alleles for two different traits can assort independently.

A dihybrid cross follows two pairs of contrasting traits at the same time. In the classic cross RrYy × RrYy, independent assortment produces four equally likely gamete types, and their combinations give the F2 phenotypic ratio 9:3:3:1. This pattern indicates that the allele pair for one trait can separate independently of the allele pair for the other, under the conditions of Mendel’s model. Thus option A is correct.

Related tags

Dihybrid CrossIndependent AssortmentMendelHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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