DISTANCE EDUCATION
M.Sc. (Zoology) DEGREE EXAMINATION, MAY 2018.
DEVELOPMENTAL BIOLOGY
Time Three hours Maximum 100 marks
SECTION A — x 8 40 marks)
Answer any FIVE questions.
All questions carry equal marks.
1. Describe the structure of a mammalian egg with suitable
illustrations.
2. Classify the types of sperm and their significance.
3. How is polyspenny prevented in organisms? What could
be the possible results of polyspermy?
4. Explain the fate map of amphibian embryo with neat
diagram.
5. Describe the various embolic morphogenetic movements
that occur during gastrulation in embryos.
6. Discuss sex-determination for developing embryo in the
light of gene involved.
7. What is organizer? Discuss its role in amphibian
development.
8. Give an account of placental classification with neat
diagrams.
Sub. Code
22
DE-4171
2
Sp 1
SECTION B — × 15 60 marks)
Answer any FOUR questions.
All questions carry equal marks.
9. Define amphimixis. Explain the physiological changes of
egg during fertilization.
10. Write a detailed account of cleavage patters observed in
embryos of different animals with a note on the factors
involved in this phenomenon.
11. Give an account on extra embryonic membranes and
their functional significance in chick development.
12. Describe the process of gastrulation in amphibia.
13. What is organogenesis? Explain in brief about the
formation of muscle and neural crest.
14. Give an account of aging as a factor altering
developmental potential.
15. Discuss the application of IVF technology in reproductive
medicine.