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.

 

Answer 1

(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.