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12th Standard Bio-Zoology English Medium Principles Of Inheritance and Variation Reduced Syllabus Important Questions 2021

12th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    15 x 1 = 15
  1. ABO blood group in man is controlled by

    (a)

    Multiple alleles

    (b)

    Lethal genes

    (c)

    Sex linked genes

    (d)

    Y-linked genes

  2. 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)

  3. Pataus’ syndrome is also referred to as

    (a)

    13-Trisomy

    (b)

    18-Trisormy

    (c)

    21-Trisormy

    (d)

    None of these

  4. The inheritance of blood group is determined by multiple alleles as discovered by _________.

    (a)

    Landsteiner

    (b)

    Bernstein

    (c)

    Alexander castelle

    (d)

    lyon

  5. XX - XO type of sex determination is in ______.

    (a)

    Cockroaches

    (b)

    Drosophila

    (c)

    Humans

    (d)

    Moths

  6. __________ was first reported by John Cotto.

    (a)

    Erythroblastosis foetalis

    (b)

    Haemophilia

    (c)

    Colour blindness

    (d)

    Haplodiploidy

  7. The gene responsible for ________ is inherited as an autosomal recessive lethal gene in man

    (a)

    Huntington's chorea

    (b)

    Albinism

    (c)

    Colourblindness

    (d)

    Phenylketonuria

  8. One gene 'L' controlling blood groups is named after_________.

    (a)

    c. B. Bridges

    (b)

    Henking

    (c)

    Landsteiner

    (d)

    Stevens

  9. The XX - XY type of sex determination is also known as ________ type.

    (a)

    Haploid - diploid

    (b)

    Lygaeus

    (c)

    Gynandromorphs

    (d)

    Genic balance

  10. A gene showing codominance has:

    (a)

    Alleles tightly linked on the same chromosome.

    (b)

    Alleles that are recessive to each other

    (c)

    Both alleles independently expressed in the heterozygote

    (d)

    One allele dominant on the other

  11. Pick out the odd man out.

    (a)

    Klinefelter's syndrome

    (b)

    Turner's syndrome

    (c)

    Huntington's chorea

    (d)

    13-Trisomy

  12. Identify the proper ratio of normal visioned individuals against colorblind 'individuals, if colorblind carrier female marries a normal male.

    (a)

    1 : 1

    (b)

    3 : 1

    (c)

    1 : 3

    (d)

    All four are normal visioned

  13. Pick out the correct statement
    (i) Karyotyping helps in gender identification
    (ii) Holandric genes are located on X-chromosome
    (iii) Trisomy-21 is an allosomal abnormality
    (iv) Cooley's anaemia is an autosomal recessive disorder

    (a)

    i, iii, iv are correct

    (b)

    ii and iii are correct

    (c)

    i and iv are correct

    (d)

    iv only correct

  14. DOPA stands for __________

    (a)

    3,4 - dihydroxy phenyl acetate

    (b)

    3,4 - dihydroxy phenyl alanine

    (c)

    3,4 - dihydroxy phenyl asparate

    (d)

    3,4 - dihydroxy phenyl aldehyde

  15. IA and IB genes of ABO blood group are __________

    (a)

    Co-dominant

    (b)

    Pleotropic

    (c)

    Dominant and recessive

    (d)

    Epistatic

  16. 2 Marks

    10 x 2 = 20
  17. What is haplodiploidy?

  18. What is criss-cross inheritance?

  19. What are holandric genes?

  20. How does hemophilia affect an individual?

  21. Name the discoverers of antigen A, B, and AB.

  22. State Wiener Hypothesis on Rb-factor.

  23. Expand (a) SRY (b) TDF

  24. Mention few X-linked inherited diseases

  25. Complete the equation.
    (a) Phenylalanine \(\underrightarrow { A } \) Tyrosine
    (b) DOPA \(\underrightarrow { B } \) Melanin

  26. Mention the genetic makeup of Turner's syndrome person and Klinefelter's syndrome person.

  27. 3 Marks

    10 x 3 = 30
  28. Mention the symptoms of Downs syndrome.

  29. Explain the genetic basis of ABO blood grouping man.

  30. Explain male heterogamety

  31. What is sex Index?

  32. What is the role of the gene responsible for colour blindness in a normal human beings?

  33. What is karyotyping?

  34. What is the chemical reaction that is affected in people suffering from Albinism?

  35. What is Sex-switch gene?

  36. Name the type of sex-determination mechanism of the following organisms. (a) Gypsy moth (b) Human beings (c) Butterflies

  37. Give an account on Patau's syndrome.

  38. 5 Marks

    7 x 5 = 35
  39. Explain the mode of sex determination in honeybees.

  40. What are the applications of Karyotyping?

  41. Explain the inheritance of sex linked characters in human being.

  42. Explain criss-cross pattern of inheritance with an example. (or) Explain Inheritance of colour blindness.

  43. Write notes on chromosomal abnormalities in human beings. (or) What is aneuploidy? Explain it

  44. Explain in detail about Erythroblastosis foetalis.

  45. Write elaborately about the following Mendelian disorders.
    (a) Thalassemia (b) Albinism

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