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Question

A genetically dwarf plant starts growing and becomes a tall plant after application of plant growth hormones. This genetically dwarf plant was crossed with a pure line tall plant and the resulting F1 hybrid was self-pollinated. What will be the phenotype of the F2 generation?

A
All will be dwarf plants
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B
All will be tall plants
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C
50% will be dwarf and 50% will be tall
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D
25% will be dwarf and 75% will be tall
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Solution

The correct option is D 25% will be dwarf and 75% will be tall
The genetically dwarf plant (tt) grew tall after its treatment with growth hormones.
However, genetically, it is a dwarf plant.
Hence, the gametes produced by this plant carried ' t 'allele for the character, height.
This dwarf plant was crossed with a pure line tall plant. Hence, the gametes produced by the pure line tall plant carried T allele for height.

When these plants are crossed, all the F1 hybrids are tall (Tt). When the F1 hybrids are self-pollinated, then the tall and dwarf plants are produced in the ratio of 3 : 1 (tall : dwarf).



Out of 4 plants, no. of dwarf plants = 1
Out of 100 plants, no. of dwarf plants =(14)×100=25
Hence, 25% of plants in the F2 generation will be dwarf.

Out of 4 plants, no. of tall plants = 3
Out of 100 plants, no. of tall plants =(34)×100=75
Hence, 75% of plants in the F2 generation will be tall.

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