A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the \(F_1\) plants were selfed the resultinggenotypes were in the ratio of

A \(3 : 1 : :\) Tall : Dwarf
B \(3 : 1 : :\) Dwarf : Tall
C \(1 : 2 : 1 : : \) Tall homozygous : Tall heterozygous : Dwarf
D \(1 : 2 : 1 : :\) Tall heterozygous : Tall homozygous : Dwarf.

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Answer & Solution

Correct Answer

(C) \(1 : 2 : 1 : : \) Tall homozygous : Tall heterozygous : Dwarf

Step-by-step Solution

Detailed explanation

(c) : When a tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plantand the \(F_1\) plants were selfed the resulting genotypes were in the ratio of \(1 : 2 : 1\) \(i.e.\), Tall homozygous :Tall heterozygous : Dwarf

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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