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In order to obtain the. F1 generation Me...

In order to obtain the. `F_1` generation Mendel pollinated a pure-breeding tall plant with a pure breeding dwarf plant. But for getting the `F_2` generation, he simply self-pollinated the tall `F_1` plants. Why?

Text Solution

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Mendel performed selfing among the `F_1` tall hybrids(Tt) in order to segregate the two-traits.
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In the experiment performed by Mendel on dihybrid inheritance, there are four types of plants formed in the F_(1) generation.

According to Mendel's experiment, the tall plants in F_(1) generation were exactly the same as the tall plants of the parent generation ? Why ?

Knowledge Check

  • A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the Fl plants were selfed the resulting genotypes were in the ratio of

    A
    1: 2: 1:: Tall heterozygous : Tall homozygous Dwarf
    B
    3:1:: Tall : Dwarf
    C
    3:1:: Dwarf: Tall
    D
    1: 2: 1 :: Tall homozygous : Tall heterozygous Dwarf

  • Hybridization experiment performed by Mendel between a tall (TT) plant and a dwarf (tt) plant of Pisum sativum gave the following result in F_(2) generation

    A
    all plants are tall
    B
    tall plants and dwarf plants in the ratio `3:1`
    C
    tall plants and dwarf plants in the ratio
    D
    tall plants and dwarf plants in the ratio `2:1`

  • During the study of incomplete dominance in a cross between true breeding flower (RR) and true breeding white flower (rr) when F_1 was sell pollinated resulted F_2 ratio may be

    A
    1 (RR) red , 2 (Rr) pink : 1 (rr) white
    B
    2 (RR) red , 1 (Rr) pink : 1 (rr) white
    C
    1 (RR) red , 1 (Rr) pink : 2 (rr) white
    D
    3 (RR) red , 1 (rr) white

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    Both the types of pea plants, used as parent generation by Mendel in his experiments, were pure breeds in the expression of their characters.

    Read the all statements carefully : (i) Mendel conducted artificial pollination/cross pollination experiments using several true breeding pea line (ii) True breeding having underogone continuous self pollination, show stable trait inheritance (iii) Mendel selected 14 true breeding pea plant varieties.

    In a monohybrid cross of plants with red and white flowered plants, Mendel got only red flowered plants. On self-pollinating these F_1 plants got both red and white flowered plants in 3:1 ratio. Explain the basis of using RR and rr symbols to represent the geno type of plants of parental generation.

    In peas, tallness is dominant over dwarfness and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them : Tall, Red =138, Tall, White = 132 Dwarf, Red =136, Dwarf, White = 128 Mention the genotypes of the two parents and of the four offspring types.

    In progeny of dihybrid cross in F_2 generation how many plants are homozygous recessive ?

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