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

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1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf. True-breeding tall is TT and true-breeding dwarf is tt, so the F1 are all Tt. Selfing Tt × Tt gives genotypes TT, Tt, Tt, tt, which is a 1:2:1 ratio. That matches tall homozygous : tall heterozygous : dwarf.

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

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