If all plants in the first generation of pure tall and pure dwarf pea plants are tall, what is the correct conclusion about the dwarf trait?
Answer and explanation
Correct answer: Dwarf trait remains hidden and is recessive
The governing concept is dominance in Mendelian inheritance. Let tallness be T and dwarfness be t. A pure tall parent is TT and a pure dwarf parent is tt, so every first-generation offspring receives T from one parent and t from the other, giving Tt. Because T is dominant, all plants look tall, while the t allele remains present but is not expressed. Thus option B is correct; the dwarf trait is hidden, not destroyed.
Frequently asked questions
What is the correct answer to this question?
Dwarf trait remains hidden and is recessive
Why is this the correct answer?
The governing concept is dominance in Mendelian inheritance. Let tallness be T and dwarfness be t. A pure tall parent is TT and a pure dwarf parent is tt, so every first-generation offspring receives T from one parent and t from the other, giving Tt. Because T is dominant, all plants look tall, while the t allele remains present but is not expressed. Thus option B is correct; the dwarf trait is hidden, 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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