LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – ZOOLOGY

TS 12

FIFTH SEMESTER – APRIL 2006

                                                                   ZO 5501 – GENETICS

(Also equivalent to ZOO 510)

 

 

Date & Time : 22-04-2006/1.00-4.00 P.M.   Dept. No.                                                       Max. : 100 Marks

 

 

Part A                                     (Answer All)                          10 X 2 = 20

1. What are multiple alleles?
2. Differentiate sex-linked genes from sex-limited genes.
3. Distinguish transitions from transversions.
4. Explain the terms cistron and recon?
5. Categorise DNA polymerases and mention their role.
6. Comment on erythrobalstosis foetalis.
7. Define heterosis.
8. Who are Klinefelters’?.
9. What are lytic and lysogenic life cycles?
10. Comment on “Feulgen staining”

 

 

Part B                                     (Answer any four)                 4 X 10 = 40

1.  Briefly explain Hardy Weinberg equilibrium.
2. Categorise numerical and structural changes in chromosomes.
3. Explain bacterial conjugation.
4. Write notes on amniocentesis.
5.  Describe the inherited metabolic disorders in man.
6.  Critically evaluate the ethical implications of biotechnology.

 

 

Part C                                     (Answer any two)                              2 X 20 = 40

1.  With suitable example explain Mendelian principles.
2. DNA is the genetic material – Justify.
3. Write an essay on maternal effects and cytoplasmic inheritance.
4. Elaborate (1) Operon model of gene regulation   (2) Human genome project.

 

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