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What does the three-to-one ratio in the second generation of a monohybrid cross show?

Answer and explanation

Correct answer: Separation of dominant and recessive traits

The governing concept is Mendel’s law of segregation. In a monohybrid cross such as Yy × Yy, the alleles separate during gamete formation, and the offspring genotypes occur as 1 YY : 2 Yy : 1 yy. Because YY and Yy show the dominant phenotype while yy shows the recessive phenotype, the observable F2 ratio becomes 3 dominant : 1 recessive. The ratio therefore reflects separation and recombination of alleles.

Related tags

Monohybrid CrossMendel LawsSegregationHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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