Why do all plants appear tall in the first generation when pure tall and pure dwarf pea plants are crossed?
Answer and explanation
Correct answer: Because the tall trait is dominant
Let the allele for tallness be T and the allele for dwarfness be t. A pure tall plant has TT and a pure dwarf plant has tt. Their cross produces F1 offspring with genotype Tt. Since T is dominant, each heterozygous plant expresses tallness even though the recessive t allele is present. Thus option A is correct; the dwarf allele is masked, not destroyed.
Frequently asked questions
What is the correct answer to this question?
Because the tall trait is dominant
Why is this the correct answer?
Let the allele for tallness be T and the allele for dwarfness be t. A pure tall plant has TT and a pure dwarf plant has tt. Their cross produces F1 offspring with genotype Tt. Since T is dominant, each heterozygous plant expresses tallness even though the recessive t allele is present. Thus option A is correct; the dwarf allele is masked, not destroyed.
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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