Genetics English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

10th Standard

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Science

Time : 01:41:00 Hrs
Total Marks : 10

    Part A

    10 x 1 = 10
  1. 9 : 3 : 3 : 1 ratio is due to

    (a)

    Segregation

    (b)

    Crossing over

    (c)

    Independent assortment

    (d)

    Recessiveness

  2. The centromere is found at the centre of the ________________ chromosome

    (a)

    Telocentric

    (b)

    Metacentric

    (c)

    Sub-metacentric

    (d)

    Acrocentric

  3. Okasaki fragments are joined together by ___________________.

    (a)

    Helicase

    (b)

    DNA polymerase

    (c)

    RNA primer

    (d)

    DNA ligase

  4. The sex chromosomes in a human cell refer to the______

    (a)

    22nd pair

    (b)

    20th pair

    (c)

    23rd pair

    (d)

    21st pair

  5. L shaped chromosomes are described as_______

    (a)

    acrocentric

    (b)

    metacentric

    (c)

    submetacentric

    (d)

    telocentric

  6. ______is not a nitrogenous base.

    (a)

    Adenine

    (b)

    Thymine

    (c)

    Leucine

    (d)

    Cytosine

  7. Choose the correct pair

    (a)

    A=T

    (b)

    G=A

    (c)

    A=C

  8. Franklin and Wilkin were awarded nobel prize for_______

    (a)

    studying DNA replication

    (b)

    studying about RNA

    (c)

    X - ray diffraction studies of DNA.

    (d)

    isolating DNA

  9. ________is a gene mutation

    (a)

    Deletion

    (b)

    Duplication

    (c)

    Translocation

    (d)

    Ploidy

  10. In human,each cell normally consists _________of chromosomes.

    (a)

    23 pairs

    (b)

    22 pairs

    (c)

    20 pairs

    (d)

    12 pairs

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