GPB 101 (2+1) Principles of Genetics Question Paper

UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR

FINAL EXTERNAL EXAMINATION

II Yr. B.Sc. (Ag.)
I Sem. 2016-17

GPB 101 (2+1)
Principles of Genetics

Date: 21-11-2016
Time: 2 Hrs.
Max. Marks: 50

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I A. CHOOSE THE APPROPRIATE ANSWER (10×0.5 = 5.0)

1. Orientation of chromosomes on equatorial plate during Meiotic metaphase-I is referred as
   a. Desynapsis
   b. Pairing
   c. Auto-orientation
   d. Co-orientation

2. Only viable gametes are produced in case of translocation heterozygote
   a. Adjacent - I
   b. Adjacent - II
   c. Alternate disjunction
   d. All of these

3. In the Lampbrush chromosomes, there is extensive RNA synthesis takes place at?
   a. Thick end loop
   b. All over the chromosome
   c. Thin end loop
   d. None of these

4. The Germplasm theory was proposed by
   a. Lamarck
   b. Mendel
   c. Weismann
   d. Hugo de vries

5. How many different types of gametes are produced by an individual having the genotype Aa Bb Cc DD EE
   a. 2
   b. 4
   c. 6
   d. 8

6. Telomeres of chromosomes help in
   a. Pairing
   b. Asynapsis
   c. Synapsis
   d. Maintaining Structural integrity

7. Number of barr bodies found in normal human male is
   a. 1
   b. 0
   c. 2
   d. 3

8. A gene contains five multiple alleles, then the number of possible genotypes will be
   a. 5
   b. 10
   c. 15
   d. 20

9. __________________ is most common method for detection of Linkage.
   a. Back cross
   b. Reciprocal cross
   c. Test cross
   d. Polycross

10. Test cross ratio of duplicate gene action will be?
    a. 1:1
    b. 3:1
    c. 1:2:1
    d. 1:1:1:1

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I B. MATCH THE FOLLOWING (5×0.5 = 2.5)

A
11. Supplementary gene
12. Complementary gene
13. Duplicate dominant gene
14. Polymeric gene
15. Inhibitory gene

B
a. 9:6:1
b. 13:3
c. 15:1
d. 9:7
e. 9:3:4

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I C. FILL IN THE BLANKS WITH APPROPRIATE ANSWERS (5×0.5 = 2.5)

16. DNA synthesis/replication takes place during __________ phase.

17. __________ are called as crossover suppressors.

18. __________ numbers of bivalents are possible in maize monosomic plants.

19. Nucleosome-solenoid model was proposed by __________.

20. Double monosomic is denoted as __________.

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II. DEFINE THE FOLLOWING (10×1.0 = 10.0)

21. Reciprocal Translocation

22. Multiple alleles

23. Chromatid

24. Endoreduplication

25. Heterochromatin

26. Mutation

27. Quantitative characters

28. Back cross

29. Pseudodominance

30. Repulsion phase of Linkage

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III. DIFFERENTIATE ANY FIVE OF THE FOLLOWING (5×2.0 = 10.0)

31. Heterochromatin Vs Euchromatin

32. Cytoplasmic Vs Nuclear inheritance

33. Complete Vs Incomplete Linkage

34. Qualitative and Quantitative characters

35. Mitosis and Meiosis

36. Lampbrush Vs Polytene chromosomes

37. Metacentric and Telocentric chromosome

38. Inversions and Translocations

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IV. ANSWER ANY FOUR OF THE FOLLOWING QUESTIONS (4×2.5 = 10.0)

39. Briefly explain types of translocations.

40. Brassica triangle.

41. DNA as genetic material (Hershy and Chase experiment).

42. Characteristics of multiple alleles.

43. Law of independent assortment of genes.

44. Sex influenced, linked and limited characters.

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V. ANSWER THE FOLLOWING (3+3+4 = 10.0)

45. RNA as genetic material (Fankel-Conrat experiment).

46. Lac operon concept.

47. Consequences of adjacent and alternate disjunctions in a translocation heterozygotes.

OR

48. Briefly explain CIB technique for detection of mutation.

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