A cross made between two pea plants produces 50% tall and 50% short pea plants. The gene combination of the p…

Question

A cross made between two pea plants produces 50% tall and 50% short pea plants. The gene combination of the parental pea plants must be

Accepted Answer

## Model Answer **(C) Tt and tt** When Tt × tt cross is performed, offspring are 50% Tt (tall) and 50% tt (short), matching the given result. ## Explanation This is a test cross (tall heterozygous × short homozygous recessive). Option A (Tt × Tt) gives 75% tall : 25% short; Option B gives all tall or 3:1; Option D gives all tall. Only Tt × tt produces the 1:1 ratio (50:50) described. Examiners expect you to recall basic monohybrid cross ratios.

Science — CBSE Class 10 board question