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12th Standard Botany - Chromosomal Basis of Inheritance English Medium Free Online Test One Mark Questions 2020 - 2021

12th Standard

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Botany

Time : 00:10:00 Hrs
Total Marks : 10

    Answer all the questions

    10 x 1 = 10
  1. An allohexaploidy contains ______.

    (a)

    Six different genomes

    (b)

    Six copies of three different genomes

    (c)

    Two copies of three different genomes

    (d)

    Six copies of one genome

  2. Accurate mapping of genes can be done by three point test cross because increases _____.

    (a)

    Possibility of single cross over

    (b)

    Possibility of double cross over

    (c)

    Possibility of multiple cross over

    (d)

    Possibility of recombination frequency

  3. Genes G S L H are located on same chromosome. The recombination percentage is between L and G is 15%, S and L is 50%, H and S are 20%. The correct order of genes is _____.

    (a)

    GHSL

    (b)

    SHGL

    (c)

    SGHL

    (d)

    HSLG

  4. Assertion (A): Gamma rays are generally use to induce mutation in wheat varieties.
    Reason (R): Because they carry lower energy to non-ionize electrons from atom

    (a)

    A and R are correct

    (b)

    A is correct. R is wrong

    (c)

    A is wrong. R is correct

    (d)

    A and R are wrong

  5. Name the scientist(s) who rediscovered the Mendelian work?
    (i) Hugo de Vries
    (ii) Carl Correns
    (iii) Tschermak
    (iv) T.H. Morgan

    (a)

    i and iv

    (b)

    i, ii and iv

    (c)

    i, ii and iii

    (d)

    ii, iii and iv

  6. Mechanism of crossing over involves the following stages. Select the correct sequence.

    (a)

    Tetrad stage ~ Synapsis ~ Bivalent stage ~ cross over

    (b)

    Syndesis ~ Tetrad ~ Crossing over ~ Terminalisation

    (c)

    Terminalisation ~ Tetrad ~ Bivalent ~ Cross over

    (d)

    Cross over ~ Bivalent ~ Tetrad ~ Terminalisation

  7. Recombination frequency (RF) is equal to

    (a)

    \(\frac { No.ofoffsprings }{ No.ofrecombinants } \times 100\)

    (b)

    \(\frac { No.of\ recombinants }{ No.ofparentalstrains } \times 100\)

    (c)

    \(\frac { No.ofrecombinants }{ No.ofoffsprings } \times 100\)

    (d)

    \(\frac { No.ofoffsprings }{ No.ofparentalstrains } \times 100\)

  8. Which is not a non-ionizing radiation?

    (a)

    X-rays

    (b)

    Gamma rays

    (c)

    Alpha rays

    (d)

    UV rays

  9. Pick out the co-mutagen from the following:

    (a)

    Eosin

    (b)

    Mustard gas

    (c)

    Ascorbic acid

    (d)

    Nitrous acid

  10. Statement 1: In transversion mutation, single purine is changed to pyrimidine.
    Statement 2: In transition mutation, a purine replaced by another purine.

    (a)

    Statement 1 is correct and Statement 2 is incorrect

    (b)

    Statement 1 is incorrect and Statement 2 is correct

    (c)

    Both the statements are correct

    (d)

    Both the statements are incorrect

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