In Mendel's monohybrid cross the recessive trait reappears in the second generation. What is the correct reason?
Answer and explanation
Correct answer: The recessive trait was hidden in the first generation, not lost
In a typical monohybrid cross, the parental alleles combine in F₁ so that the dominant phenotype is visible, while the recessive allele remains present but masked in a heterozygous genotype. During gamete formation and fertilisation, two recessive alleles may unite in an F₂ offspring, producing the recessive phenotype again, commonly in a 3:1 phenotypic ratio. Thus option A is correct.
Frequently asked questions
What is the correct answer to this question?
The recessive trait was hidden in the first generation, not lost
Why is this the correct answer?
In a typical monohybrid cross, the parental alleles combine in F₁ so that the dominant phenotype is visible, while the recessive allele remains present but masked in a heterozygous genotype. During gamete formation and fertilisation, two recessive alleles may unite in an F₂ offspring, producing the recessive phenotype again, commonly in a 3:1 phenotypic ratio. Thus option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Mendel’s laws.
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