LOYOLA COLLEGE (AUTONOMOUS), CHENNAI– 600 034

M.Sc. DEGREE EXAMINATION  –     ZOOLOGY

SECOND  SEMESTER  – NOVEMBER 2003

ZO 2801/Z  823  GENETICS                               

28.10.2003                                                                                        Max: 100 Marks

1.00 – 4.00

 

SECTION – A         

Answer ALL the questions                                                       (10 ´ 2 = 20 Marks)

1. Define positive Heterosis.
2. What are Gynandromorphs?
3. List out the types of RNA.
4. What is DNA splicing?
5. Define Nucleoid.
6. What is a competent cell?
7. Define gene pool.
8. Explain Recombination.
9. Give the names of enzymes involved in DNA replication.
10. Comment on allele.

SECTION – B

Answer any four of the following                                        (4 ´ 10 = 40 Marks)

11. Give an account of DNA repair mechanism.
12. Give an account of interferon.
13. Explain the concept of Multiple and Polygenic inheritance.
14. Give an account on chromosomal aberrations.
15. Tabulate the genetic codes and mention the significance.
16. Explain the role of carcinogens and teratogens with suitable examples.

 

Section – c

Answer any TWO of the following                                          (2 ´ 20 = 40 Marks)

17. Define transformation and explain the process of transformation and uptake of DNA.
18. Give an account of prenatal diagnosis.
19. Define Hardy-Weinberg law.  Add notes on the equilibrium frequencies for a

single locus.

 

20. Describe genetic and social implications of artificial insemination.

 

 

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