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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. - Science

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.

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Solution

Based on the given experiment, two laws were formulated by Mendel. They are as follows:-

Law of Dominance

  • According to this law, characters are controlled by discrete units called factors that occur in pairs, with one member of the pair dominating over the other in a dissimilar pair.
  • This law explains the expression of only one of the parental characters in F1 generation and expression of both in Fgeneration.

Law of Segregation

  • This law states that the two alleles of a pair segregate or separate during gamete formation in such a way that a gamete receives only one of the two factors.
  • In homozygous parents, all gametes produced are similar; while in heterozygous parents, two kinds of gametes are produced in equal proportions.
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