Question

Genotypic ratio of monohybrid cross is

• A. 3 : 1
• B. 1 : 2 : 1
• C. 1 : 1
• D. 9 : 3 : 3 : 1

Answer 1

The correct option is B 1 : 2 : 1

A monohybrid cross is conducted between pure tall plant(TT) with pure dwarf plant(tt), in the F1 generation tall plants(Tt) are formed. When this plant is subjected to self pollinatin, in the F₂ generation 3 tall plants and 1 dwarf plant is formed. The ratio between tall and dwarf plants is 3:1 and 1 plant with TT, 2 plants with Tt, 1 plant with tt are formed. The genotypic ratio is 1:2:1.

So, the correct option is ‘1:2:1’.