Identify the phenotypic ratio of Filial 2 generation given that, the parents are tall (TT) and dwarf (tt).

3 Tall, 1 Dwarf

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2 Tall, 2 Dwarf

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1 Tall, 3 Dwarf

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4 Tall, 0 Dwarf

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Solution

The correct option is A 3 Tall, 1 Dwarf
Plants raised from the seeds of pure breeding parental cross (TT and Tt) in F1 generation were all tall and monohybrids (Tt). Selfing of the F1 monohybrids (Tt and Tt) resulted in tall and dwarf plants respectively in the phenotypic ratio 3:1 (3 Tall and 1 Dwarf)

In the F2 generation 3 different types were obtained:

Tall Homozygous – TT (pure) 1

Tall Heterozygous – Tt - 2

Dwarf Homozygous – tt - 1

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