If a recessive trait appears in the second generation of a cross, what should be understood about inheritance of traits?
Answer and explanation
Correct answer: Traits can pass across generations as separate units.
The reappearance of a recessive trait in the second generation supports Mendel’s view that hereditary factors, now called alleles, are transmitted as distinct units rather than permanently blending. A recessive allele may be hidden when paired with a dominant allele in F1, but it remains present and can combine with another recessive allele in F2. Gamete formation and fertilisation are essential to this pattern. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Traits can pass across generations as separate units.
Why is this the correct answer?
The reappearance of a recessive trait in the second generation supports Mendel’s view that hereditary factors, now called alleles, are transmitted as distinct units rather than permanently blending. A recessive allele may be hidden when paired with a dominant allele in F1, but it remains present and can combine with another recessive allele in F2. Gamete formation and fertilisation are essential to this pattern. Therefore option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Inheritance.
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