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Mendel's Work

Pure -red tal...

Question

Pure -red tall pea plants are first crossed with pure -bred dwarf pea plants. The pea plants obtained in $F_{1}$ generation are then cross- bred to produce $F_{2}$ generation of pea plants.

(a) What do the plants of $F_{1}$ generation look like ?

(b) What is the ratio of tall plants to dwarf plant in $F_{2}$ generation ?

(c) Which type of plants were missing in $F_{1}$ generartion but reappeared in $F_{2}$ generation ?

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Solution

(a) Tall plant
(b) 3:1
(c) Dwarf plant

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Similar questions

Q. 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.

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?

Q. Pure tall plants are crossed with pure dwarf plants. In the

F_{1}

generation, all plants were tall. These tall plants of

F_{1}

generation were selfed and the ratio of tall to dwarf plants obtained in

F_{2}

3 : 1

. This is called as

Q. A Mendelian experiment consisted of breeding tall pea plants cross breed with dwarf pea plant.
a) What is the expected height of plants in

F_{1}

generation?
b) What will be the percentage of plants which are dwarf in

F_{2}

generation when

F_{1}

plants were selfed?
c) State the expected ratio of genotype TT and Tt in

F_{2}

Q. A tall pea plant with round seeds (TTRR) is crossed with a dwarf wrinkle seeded plant (ttrr).

F_{1}

has tall plants with rounded seeds. What is the proportion of dwarf plants with wrinkled seeds in

F_{2}

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