Principles of Inheritance and Variation Model Question Paper

12th Standard EM

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Biology

Time : 01:00:00 Hrs
Total Marks : 50
    5 x 1 = 5
  1. ABO blood group in man is controlled by

    (a)

    Multiple alleles

    (b)

    Lethal genes

    (c)

    Sex linked genes

    (d)

    Y-linked genes

  2. Which of the following is true about Rh factor in the offspring of a parental combination DdXDd (both Rh positive)?

    (a)

    All will be Rh-positive

    (b)

    Half will be Rh positive

    (c)

    About ¾ will be Rh negative

    (d)

    About one fourth will be Rh negative

  3. XO type of sex determination and XY type of sex determination are examples of

    (a)

    Male heterogamety

    (b)

    Female heterogamety

    (c)

    Male homogamety

    (d)

    Both (b) and (c)

  4. _________ proposed the existence of 8 alleles at a single Rh locus.

    (a)

    Fischer

    (b)

    Landsteiner

    (c)

    Bernstein

    (d)

    Wiener

  5. The lygaeus type (XX - XY) type of sex determination is seen in ______

    (a)

    Fishes

    (b)

    Chickens

    (c)

    Human beings

    (d)

    Gypsy moth

  6. 5 x 2 = 10
  7. What is Lyonisation?

  8. What is criss-cross inheritance?

  9. What are Gynandromorphy?

  10. State the allelic forms of I gene and mention its chromosomal location.

  11. Based on Lyon's hypothesis, mention the number of Barr bodies in XXY males, XO females.

  12. 5 x 3 = 15
  13. How is sex determined in human beings?

  14. Brief about female heterogamety

  15. What is null allele?

  16. What are Y linked or holandric genes?

  17. What is euphenics?

  18. 4 x 5 = 20
  19. What are the applications of Karyotyping?

  20. What is extra chromosomal inheritance? Explain with an example

  21. Write a note on any 2 Mendelian disorders occurring in human beings.

  22. Explain in detail about Erythroblastosis foetalis.

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