A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed, the resulting genotypes were in the ratio of:
1:2:1 :: Tall heterozygous : Tall homozygous : Dwarf
3:1 :: Tall : Dwarf
3:1 :: Dwarf : Tall
1:2:1 :: Tall homozygous : Tall heterozygous : Dwarf
, a cross between true-breeding tall (TT) and dwarf (tt) pea plants produces F1 hybrids that are all tall (Tt). When these F1 plants are self-pollinated (Tt x Tt), the F2 generation exhibits a genotypic ratio of 1:2:1 (1 TT : 2 Tt : 1 tt). This corresponds to 1 Tall homozygous : 2 Tall heterozygous : 1 Dwarf.
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