LOYOLA  COLLEGE (AUTONOMOUS), CHENNAI-600 034.

M.Sc. DEGREE  EXAMINATION  – ZOOLOGY

first SEMESTER  – APRIL 2003

ZO 1803/  Z  722 advanced developmental biology

08.04.2003

1.00 – 4.00                                                                                          Max: 100 Marks

 

                                               PART – A                              (10 ´ 2 = 20 Marks)

Answer ALL questions.  Each question carries two marks

 

1. Comment on Von Baer’s contribution.
2. Trace the origin of primordial germ cells.
3. Define vitellogenesis and mention its significance.
4. State any two theories of fertilization.
5. Define chemodifferentiation.
6. Illustrate a fate map.
7. Distinguish a morula from blastula
8. Name any two derivatives of mesoderm and endoderm.
9. Mention the function of allantois and chorion.
10. What is exogastrulation?

 

PART – B                                           (4´ 10 = 40 Marks)

Answer any four questions.  Each question carries ten marks

 

11. How do you associate the process of aging with development?
12. Describe polarity, symmetry met within eggs.
13. Explain the various stages involved in parturition.
14. Trace the origin and development of excretory organs from the mesoderm.
15. Illustrate the extra embryonic membranes of chick.
16. Mention the physico chemical factors involved in cleavage.

 

PART – C                                                      (2 ´ 20 = 40 Marks)

Answer any TWO questions.  Each question carries 20 marks

 

17. Describe the events involved in human embryonic development and explain the

role of  placentation in this regard.

18. Outline the protocol of human cloning and add a note on its ethical implications.
19. Explain the role of organizers and induction in the context of Speemann’s experimentation.
20. Explain the role of genetics and hormones in the developmental process.

 

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