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The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratio as 1:2:1 unlike that the Mendel’s monohybrid F2 ratio. - Biology

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The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratio as 1:2:1 unlike that the Mendel’s monohybrid F2 ratio. With the help of a suitable example, work out a cross and explain how it is possible.

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Solution

Monohybrid cross is a cross where two forms of a single trait are hybridised. Mendel crossed a pure tall pea plant with a pure dwarf pea plant and obtained all tall plants in the first filial generation. The character which appeared in the F1 generation is called the dominant character, whereas the character which is not expressed in the F1 generation is called the recessive character. After intercrossing the hybrids of the F1 generation, he obtained the tall and the dwarf progeny in the ratio 3:1 (phenotypic ratio), but the genetic ratio was 1:2:1 which is TT, Tt and tt.

Concept: Mendel’s Laws of Inheritance
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