Heredity Model Question Paper

10th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. The haploid condition in a human cell refers to________ chromosomes

    (a)

    44

    (b)

    23

    (c)

    46

    (d)

    22

  2. ______is not a nitrogenous base.

    (a)

    Adenine

    (b)

    Thymine

    (c)

    Leucine

    (d)

    Cytosine

  3. Choose the correct pair

    (a)

    A=T

    (b)

    G=A

    (c)

    A=C

  4. 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

  5. Down's syndrome is a case of___________

    (a)

    Euploidy

    (b)

    Deletion

    (c)

    Translocation

    (d)

    Aneuploidy

  6. 4 x 2 = 8
  7. Explain the role of Okazaki fragments

  8. Write a note on euploidy.

  9. List any three traits of pea plant selected by Mendel for his experiments and mention their dominant & recessive form

  10. Differentiate diploid and haploid condition.

  11. 4 x 4 = 16
  12. How are chromosomes classified based on the position of centromere?

  13. Write a note on DNA replication.

  14. Write a note on mutation

  15. Mala had a huge scar on her cheek after she met with fire accident during her college days. She is worried ifher baby would inherit the scar she had acquired. She clarified with her doctor, she need not worry about it, as her scar is an acquired trait.
    (i) What are acquired traits?
    (ii) How is it different from inherited traits?

  16. 3 x 7 = 21
  17. How is the structure of DNA organised? What is the biological significance of DNA?

  18. Flowers of the garden pea are bisexual and self-pollinated. Therefore, it is difficult to perform hybridization experiment by crossing a particular pistil with the specific pollen grains. How Mendel made it possible in his monohybrid and dihybrid crosses?

  19. Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1 generation are then cross-bred to produce F2 generation of pea plants.
    a. What do the plants of F1 generation look like?
    b. What is the ratio of tall plants to dwarf plants in F2 generation?
    c. Which type of plants were missing in F1 generation but reappeared in F2 generation?

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