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.
(a) Which of the plants A and B are: (i) tall, and (ii) dwarf?
(b) Give reason for your answer.

Answer 1

(a) (i) Tall - Plant B
(ii) Dwarf - Plant A

(b) In pea plants, tallness is a dominant trait whereas dwarfness is a recessive trait. Plants like A do not appear in the F₁ generation but reappear in the F₂ generation which means that plant A is dwarf whereas plant B is tall.



We can see from the cross that, tall plants appear in the F₁ generation but no dwarf plants are seen.
The dwarf plants are seen in F₂ generation.