Question

In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be (a) 1 3
(b) 3 1
(c) 1 1
(d) 2 1

Answer 1

(C) 1 : 1

Explanation:

When a pure tall plant (TT) is crossed with a pure short plant (tt), the F1 generation produces heterozygous tall (Tt) plants.

Upon Selfing the F1 generation, that is, crossing two heterozygous tall plants, following numbers of F2 generation are obtained phenotypically-

• Three tall plants and one short plant

whereas, Genotypically, the following ratio is obtained-

• one pure tall plant, two heterozygous tall plants and one pure short plant.

Thus, considering the genotype, the ratio of pure tall plants to pure short plants in the F2 generation is 1:1

Answer 2

The ratio of pure tall plants to pure short plants in F2 generation will be 3:1.

Option B

Explanation:

• According to the mechanism of inheritance, when a pure tall plant and short plant crossed together, the resulting offsprings of f1 generation are all tall.
• Breeding of the offspring from f1 generation results in the growth of both "tall and short plants".
• There was one short plant in four. So, ratio of a tall and short plant in second or f2 generation is 3:1.
• The traits may not show up, but they will be transferred to next generation.

To learn more about mechanism of inheritance:

Give the basic features of the mechanism of inheritance

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