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

10th Standard

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Science

Time : 00:10:00 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 loss of one or more chromosome in a ploidy is called_____________.

    (a)

    Tetraploidy

    (b)

    Aneuploidy

    (c)

    Euploidy

    (d)

    polyploidy

  5. The haploid condition in a human cell refers to________ chromosomes

    (a)

    44

    (b)

    23

    (c)

    46

    (d)

    22

  6. L shaped chromosomes are described as_______

    (a)

    acrocentric

    (b)

    metacentric

    (c)

    submetacentric

    (d)

    telocentric

  7. ______is not a nitrogenous base.

    (a)

    Adenine

    (b)

    Thymine

    (c)

    Leucine

    (d)

    Cytosine

  8. Down's syndrome is a case of___________

    (a)

    Euploidy

    (b)

    Deletion

    (c)

    Translocation

    (d)

    Aneuploidy

  9. ________is a gene mutation

    (a)

    Deletion

    (b)

    Duplication

    (c)

    Translocation

    (d)

    Ploidy

  10. Hydrogen bonds between the nitrogeneous bases make the DNA molecule________

    (a)

    unstable

    (b)

    stable

    (c)

    unbalanced

    (d)

    disturbed

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