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Question

What is the genotypic ratio of plants in F2 generation when a tall pea plant (TT) is crossed with a dwarf pea plant (tt)?


A

3(TT) : 1 (tt)

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B

3(Tt) : 1 (tt)

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C

1(Tt) : 2(TT) : 1(tt)

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D

1(TT) : 2(Tt) : 1(tt)

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Solution

Crossing of homozygous tall TT with a homozygous dwarf (tt), is called Monohybrid cross. In this, all F1 progeny are heterozygous tall(Tt). In the F2 generation, 1 homozygous tall(TT), 2 heterozygous tall(Tt), homozygous dwarf(tt), genotypically. Phenotypically, 3 tall and 1 dwarf plants are present.

So, the correct option is D. 1(TT) : 2(Tt) : 1(tt)


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