If a plant appears tall but also carries information for dwarfness, how can a dwarf plant appear among its offspring?
Answer and explanation
Correct answer: When the recessive form for dwarfness is received from both parents
A tall plant may be heterozygous, represented as Tt, where T is dominant for tallness and t is recessive for dwarfness. Its tall appearance hides the effect of t, but the plant can pass t to some gametes. If the other parent also contributes t, the offspring genotype becomes tt and the dwarf phenotype is expressed. Hence option A is correct; no gamete formation would prevent sexual reproduction, and chromosome doubling is irrelevant.
Frequently asked questions
What is the correct answer to this question?
When the recessive form for dwarfness is received from both parents
Why is this the correct answer?
A tall plant may be heterozygous, represented as Tt, where T is dominant for tallness and t is recessive for dwarfness. Its tall appearance hides the effect of t, but the plant can pass t to some gametes. If the other parent also contributes t, the offspring genotype becomes tt and the dwarf phenotype is expressed. Hence option A is correct; no gamete formation would prevent sexual reproduction, and chromosome doubling is irrelevant.
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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