DISTANCE EDUCATION
M.Sc. (Zoology) DEGREE EXAMINATION, DECEMBER 2017.
DEVELOPMENTAL BIOLOGY
Time Three hours Maximum 100 marks
SECTION A — × 8 40 marks)
Answer any FIVE questions.
All questions carry equal marks.
1. Write in brief the process of oogenesis in a typical
metazoan.
2. Describe the sperm attraction towards egg by chemotaxis.
3. Explain acrosomal reaction and its importance in
fertilization process.
4. Explain Spemann's primary organizer concept.
5. Give an account on the ectodermal derivatives with
suitable examples.
6. What is the necessity of a placenta in animal? Add a note
on its physiological role.
7. Discuss the importance of artificial reproductive
technologies in human welfare.
8. Describe the process of cryopreservation on cattle
sperm.
Sub. Code
22
DE-3059
2
Ws6
SECTION B — × 15 60 marks)
Answer any FOUR questions.
All questions carry equal marks.
9. What is cortical reaction? Write down a detailed account
on the process of fertilization with an emphasis on the
events on egg activation.
10. Write a brief account of blastula types observed in
different animals with a note on the factors involved in
this phenomenon.
11. Discuss the morphogenetic movements takes place during
gastrulation.
12. Write an essay about neurogenesis.
13. Give an account on the stages of differentiation of lens in
the eye of a vertebrate with suitable diagrams.
14. Discuss in detail the human birth defects with regard to
chromosomal disorders.
15. Write an account on knock-out and knock-in mechanism
involved in development of gene.
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