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Laws of Mendel

Pure-bred pea...

Question

Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F₁ generation but re-emerge in F₂ generation. Which of the plants A and B are : (i) tall, and (ii) dwarf? Give reason for your answer.

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Solution

(i) Pea plants B are the tall ones. It is because these plants carry the trait for tallness, which is dominant.

(ii) Pea plants A are dwarfs. It is because these plants carry the trait for dwarfism, which is recessive. A recessive trait remains hidden in F₁ generation but reappears in F₂ generation.

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Similar questions

Q. If we cross pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get Pea plant of

F_{1}

generation, then we obtain Pea plants of

F_{2}

generation.
(a) What do the plants of

F_{1}

generation look like?
(b) State the ratio of tall plants to dwarf plants in

F_{2}

generation.
(c) State the type of plants not found in

F_{1}

generation but appeared in

F_{2}

generation, mentioning the reason for the same.

Q. A person first crossed pure-bred pea plants having round-yellow seeds with pure-bred pea plants having wrinkled-green seeds and found that only A-B type of seeds were produced in the

F_{1}

generation. When

F_{1}

generation pea plants having A-B type of seeds were cross-bred by self-pollination, then in addition to the original round-yellow and wrinkled-green seeds, two new varieties A-D and C-B type of seeds were also obtained.

In one of his experiments with pea plants, Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant, in the first generation

F_{1}

only tall plants appear.

F_{1}

generation plants were self-fertilized, he observed that in the plants of second-generation

F_{2}

both tall plants and dwarf plants were present. Why did it happen? Explain briefly.
(ii)What happens to the traits of the dwarf plants in this case?

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