M.Sc. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2017.
Third Semester
Zoology
Paper III DEVELOPMENTAL BIOLOGY
2 20833-AA
Time 3 Hours Max. Marks 70
SECTION — A
Answer any SIX questions. 5 30 Marks)
1. Leydig cells.
2. Cell death.
3. Stem cells.
4. Eye lens induction.
5. Metamorphosis.
6. Fate maps.
7. Regeneration.
8. Cleavage.
SECTION — B
Answer ALL questions. 10 40 Marks)
9. Describe the molecular events of post fertilization.
Or
Write an essay on endocrine regulation of vitellogenesis.
10. Give an account on molecular mechanisms of determining germ layers
formation.
Or
Describe the axes and pattern formation in Drosophila.

11. Give an account on neural fold formation in vertebrates and add a note on
limb development.
Or
Give an account on hormonal regulation of metamorphosis in insects.
12. Describe the sex determination in animals.
Or
Give an account on biochemical and molecular mechanisms involved in
apoptosis.