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

 

UNIVERSITY OF AGRICULTURAL SCIENCES, BENGALURU

FINAL EXTERNAL EXAMINATION (II SEMESTER 2014-15)
GPB 101: Principles of Genetics (2+1)
Date: 22.06.2015 | Time: 25 Min. (10:00 to 10:45 AM)

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PART-A: OBJECTIVE TYPE QUESTIONS

I.A. Choose the Appropriate Answer (25 × 0.50 = 12.50 Marks)

1. Mendel discovered the laws of dominance and independent assortment in:
   A. E. coli
   B. Neurospora crassa
   C. Pisum sativum
   D. Mirabilis jalapa

2. Phenotypic and genotypic ratios are the same in:
   A. Back cross
   B. Test cross
   C. Both A and B
   D. Monohybrid cross

3. Exchange of genetic material between non-sister chromatids occurs during:
   A. Linking
   B. Recombination
   C. Synapsis
   D. Transduction

4. Genotypic ratio for incomplete dominance is:
   A. 9:3:3:1
   B. 9:4:3
   C. 1:2:1
   D. 3:1

5. Ratio for duplicate dominant epistasis is:
   A. 13:3
   B. 9:3:4
   C. 15:1
   D. 9:7

6. Linkage is characterized by:
   A. Adjacent genes on the same chromosome
   B. Genes on different chromosomes
   C. Both A and B

7. Mutations most commonly occur due to:
   A. Irradiation
   B. UV rays
   C. Chemical induction
   D. Natural causes

8. Multiple alleles exhibit:
   A. Dominance
   B. Co-dominance
   C. Both A and B
   D. Expressivity

9. Jacob and Monod hypothesized the:
   A. Sex-linked inheritance
   B. Extrachromosomal inheritance
   C. Lac operon concept
   D. Double helix model

10. Recombination occurs during ______ of prophase I:
    A. Pachytene
    B. Metaphase
    C. Leptotene
    D. Diplotene

11. Eukaryotic RNA is ______ stranded:
    A. Double
    B. Single
    C. Both A and B
    D. Triple

12. Protein synthesis occurs in:
    A. Ribosomes
    B. Golgi apparatus
    C. Plastids
    D. Both B and C

13. Polyploids have multiples of:
    A. Nucleus
    B. Chromatids
    C. Genomes
    D. Chromosomes

14. Monocistronic gene structure is found in:
    A. Bacteria
    B. Plants
    C. Yeast
    D. Both B and C

15. RNA polymerase recognizes the ______ to initiate transcription:
    A. Ribosome
    B. Intron
    C. Codon
    D. Promoter

16. Pleiotropy involves control of multiple traits by a single:
    A. Chromosome
    B. Gene
    C. Allele
    D. Both B and C

17. Cap and poly-A tail are present in ______ mRNA:
    A. E. coli
    B. Yeast
    C. Both A and B
    D. Actinomycetes

18. DNA contains:
    A. Ribose
    B. Deoxyribose
    C. Both A and B
    D. Sucrose

19. DNA replication initiates at:
    A. CAAT box
    B. Ori C
    C. Cap structure
    D. TATA box

20. "Powerhouse of the cell" refers to:
    A. Nucleus
    B. Mitochondria
    C. Ribosome
    D. Golgi apparatus

21. Example of maternal inheritance:
    A. Plant height
    B. Male sterility in plants
    C. Yield
    D. All of these

22. DNA base pairs are held by:
    A. Van der Waals forces
    B. Electrostatic bonds
    C. Ionic bonds
    D. Covalent bonds

23. Chargaff’s rules state equality of purines and pyrimidines, proposed by:
    A. Wilkins and Chargaff
    B. Jacob and Monod
    C. Watson and Crick
    D. Benzer

24. Monoploids possess:
    A. 4n
    B. 6n
    C. n
    D. 2n

25. Major DNA repair enzyme:
    A. Helicase
    B. Topoisomerase
    C. DNA polymerase-II
    D. DNA polymerase-I

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I.B. State True or False (15 × 0.50 = 7.50 Marks)

26. Endoreduplication produces special chromosomes.

27. Lethal genes induce lethality.

28. Chloroplast synthesizes fats from light energy.

29. Polycistronic genes are controlled by a single promoter.

30. Sex chromosomes determine gender in humans.

31. DNA’s stability makes it genetic material.

32. Chromosomal deletions are usually harmful.

33. Cytoplasmic inheritance is male-transmitted.

34. Protein synthesis occurs in the cell wall.

35. Mendel discovered RNA polymerase.

36. Epistasis modifies Mendelian ratios.

37. Colchicine induces polyploidy.

38. Mendel used French beans (incorrect; used peas).

39. Incomplete dominance violates the law of dominance.

40. Genetics studies speciation origins.

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I.C. Match the Following (10 × 0.50 = 5.00 Marks)

Column A	Column B
41. Allopolyploid	D. Wheat
42. Blood group	E. Multiple alleles
43. Chloroplast	B. Maternal inheritance
44. Watson and Crick	C. Semi-conservative replication
45. Genic interaction	A. Epistasis
46. Continuous variation	H. Polygenes
47. Benzer	F. Gene concept
48. Transcriptionally inactive	G. Heterochromatin
49. Physical mutagen	J. Gamma rays
50. Thomas Morgan	I. Linkage

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