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In peas, tallness is dominant over dwarf...

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.

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Knowledge Check

  • If heterozygous tall plant is crossed with a homozygous dwarf plants, then the ratio of dwarf plant is

    A
    A. 0.25
    B
    B. 0.5
    C
    C. 0.75
    D
    D. 1

  • A cross between pure tall, green seeds and pure dwarf yellow seeds is crossed with pure dwarf and green seeds then number of phenotype produced are

    A
    2
    B
    6
    C
    4
    D
    1

  • In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (1). If a plant with RRTt genotype is crossed with a plant that is rrtt then

    A
    25 % will be tall with red fruit
    B
    50 % will be tall with red fruit
    C
    75 % will be tall with red fruit
    D
    all the offspring will be tall with red fruit.

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