On crossing tall homozygous plant with dwarf plant Mendel found the ratio of dwarf plants in F $_{2}$ generation was?

25%

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40%

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60%

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75%

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Solution

The correct option is A 25%
Given: Tall plant (TT) and dwarf plant (tt)
Cross between the parents: TT x tt
F $_{1}$ generation: Tt
Crossing of Tt and Tt
Progenies in F $_{2}$ generation: TT (tall), Tt (tall), Tt (tall), tt (dwarf)
Since T is the dominant allele, it will be expressed in heterozygous condition as well.
Hence, the percentage of the dwarf plant is 1/4 (i.e. 25%).

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What will be the ratio of tall and dwarf plants in the F2 generation when a homozygous tall plant is crossed with homozygous dwarf plant?

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