The phenotypic ratio of the monohybrid cross for tall:dwarf in the F2 generation is

3:1

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1:2:1

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1:3

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1:1

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Solution

The correct option is A 3:1
A monohybrid cross is a breeding experiment in which two individuals of the same species that differ in a single trait are cross bred. The cross bred individuals are homozygous for the given trait.
In a cross between homozygous tall and dwarf plants, the F1 generation plants obtained are all heterozygous tall. When these plants are crossed with each other, the phenotypic ratio would be 3:1, with three-fourths of the plants being tall (TT and Tt) and one-fourth dwarf plants (tt).

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