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.
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What is the correct answer to this question?
Separation of dominant and recessive traits
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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