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In a monohybrid cross, what does the 3:1 ratio in the second generation prove?

Answer and explanation

Correct answer: Alleles for a trait segregate and can recombine in new combinations.

The 3:1 phenotypic ratio in the F2 generation is characteristic of a monohybrid cross between two heterozygotes, such as Tt × Tt. The alleles separate when gametes form, and fertilisation recombines them. The genotypic ratio is 1 TT:2 Tt:1 tt, which produces a 3 tall:1 dwarf phenotype ratio when T is dominant. Hence option A is correct; recessive alleles are hidden, not erased.

Related tags

Monohybrid RatioSegregationMendelHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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