Question

why is genotype ratio of F1 generation of monohybrid cross is written as 1:2:1 not 1:1:2 ??​

Answer 1

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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’.

Answer 2

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.

the correct option is ‘1:2:1’.