Heredity Model Question Paper

10th Standard EM

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Science

Time : 02:30:00 Hrs
Total Marks : 60
    8 x 1 = 8
  1. 9 : 3 : 3 : 1 ratio is due to

    (a)

    Segregation

    (b)

    Crossing over

    (c)

    Independent assortment

    (d)

    Recessiveness

  2. The region of the chromosome where the spindle fibres get attached during cell division

    (a)

    Chromomere

    (b)

    Centrosome

    (c)

    Centromere

    (d)

    Chromonema

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

    (a)

    Telocentric

    (b)

    Metacentric

    (c)

    Sub-metacentric

    (d)

    Acrocentric

  4. The _____________ units form the backbone of the DNA.

    (a)

    5 carbon sugar

    (b)

    Phosphate

    (c)

    Nitrogenous bases

    (d)

    Sugar phosphate

  5. Okasaki fragments are joined together by ___________________.

    (a)

    Helicase

    (b)

    DNA polymerase

    (c)

    RNA primer

    (d)

    DNA ligase

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

    (a)

    44

    (b)

    23

    (c)

    46

    (d)

    22

  7. L shaped chromosomes are described as_______

    (a)

    acrocentric

    (b)

    metacentric

    (c)

    submetacentric

    (d)

    telocentric

  8. ________is a gene mutation

    (a)

    Deletion

    (b)

    Duplication

    (c)

    Translocation

    (d)

    Ploidy

  9. 5 x 1 = 5
  10. The thin thread like structures found in the nucleus of each cell are called _________.

    ()

    chromosomes

  11. DNA consists of two ____________ chains

    ()

    polynucleotide

  12. An inheritable change in the amount or the structure of a gene or a chromosome is called _______________.

    ()

    mutation

  13. The number of chromosomes present in a human cell is_________

    ()

    46

  14. __________stated base pair rule.

    ()

    .Chargaff

  15. 5 x 1 = 5
  16. Allosome

  17. (1)

    Basic principles of Heredity

  18. Dihybrid ratio

  19. (2)

    Replication fork

  20. Mendel

  21. (3)

    9:3:3:1

  22. Topo isomerase

  23. (4)

    Replication site

  24. Helicase

  25. (5)

    23rd pair of chromosome

    2 x 2 = 4
  26. Define a gene

  27. Mention the types of gene or point mutation

  28. 4 x 2 = 8
  29. What is nucleolar organizer?

  30. Write a note on euploidy.

  31. State the Law of Independent Assortment

  32. Differentiate diploid and haploid condition.

  33. 4 x 4 = 16
  34. Why did Mendel select pea plant for his experiments?

  35. What are allosomes?

  36. Explain the structure of a chromosome

  37. Write a note on mutation

  38. 2 x 7 = 14
  39. Explain with an example the inheritance of dihybrid cross. How is it different from monohybrid cross?

  40. How is the structure of DNA organised? What is the biological significance of DNA?

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