A pure dwarf Pisum sativum (pea) plant was treated with Gibberrelic Acid $(G A_{3})$ . It then becomes tall. If this plant is crossed with a pure tall plant, what will be the phenotype in the next generation.

100% tall

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50% tall and 50% dwarf

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75% tall and 25% dwarf

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100% dwarf

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Solution

The correct option is A 100% tall
The pure dwarf plant has the genotype as tt. The treatment of this plant with gibberellic acid will cause the plant to become tall but the genotype will remain same. The dwarf plant is crossed with a pure tall plant (TT). So the progeny will have the genotype as Tt and all will be tall as the tall allele (T) is dominant to dwarf allele (t).
Thus, the correct answer is option A.

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A pure dwarf Pisum sativum (pea) plant was treated with Gibberrelic Acid (GA3). It then becomes tall. If this plant is crossed with a pure tall plant, what will be the phenotype in the next generation.

A pure dwarf Pisum sativum (pea) plant was treated with Gibberrelic Acid $(G A_{3})$ . It then becomes tall. If this plant is crossed with a pure tall plant, what will be the phenotype in the next generation.