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Question
Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F1 generation but re-emerge in F2 generation. Which of the plants A and B are : (i) tall, and (ii) dwarf? Give reason for your answer.
Solution
(1) Pea plants B are the tall ones. It is because these plants carry the trait for tallness, which is dominant.
(2) Pea plants A are dwarfs. It is because these plants carry the trait for dwarfism, which is recessive. A recessive trait remains hidden in F1 generation but reappears in F2 generation.
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