Topic: Mendelian inheritance· Genetics and Evolution

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 resulting genotypes were in the ratio of :

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

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

3. 3 : 1 :: Tall : Dwarf

4. 3 : 1 :: Dwarf : Tall

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Answer: 1. 1 : 2 : 1 :: Tall homozygous : Tall heterozygous : Dwarf

Key idea: A TT × tt cross gives all Tt in F₁. Selfing F₁ (Tt × Tt) gives 1 TT : 2 Tt : 1 tt.

This is a genotypic ratio of 1 tall homozygous : 2 tall heterozygous : 1 dwarf, which is option (1). The 3 : 1 ratio is the phenotypic ratio, not the genotypic one.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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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 resulting genotypes were in the ratio of :

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