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Calculation of Phenotypic and Genotypic Ratios

A tall true b...

Question

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:

A

1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf

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B

1 : 2 : 1 :: Tall heterozygous : Tall homozygous : Dwarf

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C

3 : 1 :: Tall : Dwarf

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D

3 : 1 :: Dwarf : Tall

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Solution

The correct option is A 1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf
When a tall ( TT ) true breeding garden pea plant is crossed with a dwarf ( tt ) true breeding garden pea plant. All the plants in the F1 generation will be tall with genotype ( Tt ).
When the F1 plants (Tt ) were selfed the resulting genotypes were in the ratio of 1 : 2 : 1 :: Tall homozygous (TT) : Tall heterozygous (Tt) : Dwarf (tt)

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