Question

Monohybrid cross produced both tall and dwarf Pea plants in the ratio of 3 : 1. Their genotypes would be _______________.

• A. TT $\times$ Tt
• B. Tt $\times$ Tt
• C. Tt $\times$ tt
• D. TT $\times$ tt

Answer 1

The correct option is B Tt $\times$ Tt

Crossing of homozygous tall TT with a homozygous dwarf (tt), is called Monohybrid cross. In this, all F₁ progeny are heterozygous tall(Tt). In the F₂ generation, 1 homozygous tall(TT), 2 heterozygous tall(Tt), homozygous dwarf(tt), genotypically. Phenotypically, 3 tall and 1 dwarf plants are present.

So, the correct option is ‘Tt x Tt’.