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Solution


Q.

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    [2016]
1 3 : 1 : : Tall : Dwarf  
2 3 : 1 : : Dwarf : Tall  
3 1 : 2 : 1 : : Tall homozygous : Tall heterozygous : Dwarf  
4 1 : 2 : 1 : : Tall heterozygous : Tall homozygous : Dwarf  

Ans.

(3)

When a tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant and the F1 plants were selfed the resulting genotypes were in the ratio of 1 : 2 : 1, i.e., Tall homozygous : Tall heterozygous : Dwarf
It can be illustrated as given below:

Phenotypic ratio: 3 : 1 :: Tall : Dwarf
Genotypic ratio: 1 : 2 : 1 :: TT : Tt : tt