How can the dwarf trait reappear in the second generation even if it is not visible in the first generation?
Answer and explanation
Correct answer: Because it remains hidden as a recessive form in the first generation
In the F1 generation from a pure tall TT × pure dwarf tt cross, all plants are Tt. The dominant T allele masks the recessive t allele, so dwarfness is not expressed, but the t allele remains present. When F1 plants self-pollinate, the F2 combinations include TT, Tt, Tt, and tt. The tt plants express dwarfness, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Because it remains hidden as a recessive form in the first generation
Why is this the correct answer?
In the F1 generation from a pure tall TT × pure dwarf tt cross, all plants are Tt. The dominant T allele masks the recessive t allele, so dwarfness is not expressed, but the t allele remains present. When F1 plants self-pollinate, the F2 combinations include TT, Tt, Tt, and tt. The tt plants express dwarfness, so option A is correct.
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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