. In a monohybrid cross between tall pea plants (TT) and short pea plants
(Tt) a scientist obtained only tall pea plants (Tt) in the F1 generation. However, on selfing the F1 generation pea plants, he obtained both tall and short plants in F2 generation. On the basis of above observations with other angiosperms also, can the scientist arrive at a law? If yes, explain the law. If not, give justification for your answer.
Ans. Law of Segregation:
When plants of two different traits of character are crossbred to get a progeny (F1 generation), only the dominant trait is visible in this generation. But when plants of F1 generation are selfbred then the two traits of character get separated and the recessive traits also appears in the plant of F2 generation. This is known as Law of Segregation (separation) of traits.
Law of Dominance:
According to this law, the characteristics (or traits) of an organism are determined by internal 'factors' which occur in pairs. Only one of a pair of such factors can be presented in a single gamete. This law explains expression of only of the parental character in F1 generation and expression of both in F2 generation.