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A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the plants were selfed the resulting genotypes were in the ratio
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1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf
Mendel did the crossing of pure tall plant represented by (TT) with a pure dwarf plant represented by (tt). In the F1 generation of this cross, plants formed are tall (Tt). When this plant from F1 generation undergoes self-pollination, then in the F2 generation, three tall plants and one dwarf plants are seen. In this 1 homozygous tall plant (TT), two heterozygous tall plants(Tt), 1 homozygous dwarf plant(tt) are formed. Phenotypic ratio is 3:1::Tall:Dwarf, while the genotypic ratio becomes 1:2:1::Tall homozygous : Tall heterozygous : Dwarf
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