If two hybrid tall pea plants are crossed, why can dwarf plants appear again?
Answer and explanation
Correct answer: A dwarf plant can result when it receives a recessive allele from both parents.
Let T represent the dominant tall allele and t the recessive dwarf allele. A hybrid tall plant has genotype Tt. In the cross Tt × Tt, the possible combinations are TT, Tt, Tt, and tt. The tt offspring receive the recessive allele from both parents and therefore show the dwarf phenotype. Thus option A is correct; tallness is not destroyed and the environment does not create this inherited combination.
Frequently asked questions
What is the correct answer to this question?
A dwarf plant can result when it receives a recessive allele from both parents.
Why is this the correct answer?
Let T represent the dominant tall allele and t the recessive dwarf allele. A hybrid tall plant has genotype Tt. In the cross Tt × Tt, the possible combinations are TT, Tt, Tt, and tt. The tt offspring receive the recessive allele from both parents and therefore show the dwarf phenotype. Thus option A is correct; tallness is not destroyed and the environment does not create this inherited combination.
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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