CBSE Class 10 Science 2023 Outside Delhi Set 1

Question : 9

Total: 39

In an experiment with pea plants, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plant to pure short plants in F2, generation will be

Solution:

Explanation: Parent generation TT (pure tall)× tt(Pure dwarf)
Gametes T t
F1 generation Tt (heterozygous tall)
F2 generation

Gametes Tt→ Tt←	T	t
T	TT	tT
t	tT	TT

F2 Genotypic ratio =1 pure tall (TT):2 heterozygous tall (Tt):1 pure dwarf (tt); Thus, the ratio of pure tall to pure short plants will be 1:1.

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