zoology Arena

Q:-1 What is dosage compensation? Explain lyonnhypothesis. Discuss its significance. (20) Q:-2 Discuss the sex determination process in Drosophila. How it is different from humans. (15) Q:-3 Describe the molecular mechanism of sex determination in human. Comment on evolution of Y chromosome in mammals. (20) Q:-4 What are anadromous fishes? How their migration process different from catadromous fishes. Describe the significance of migration. (20) Q:-5 Discuss the process of osmoregulation in pieces. Describe their respiration in brief. (15)

Q:-1 Explain the metamorphosis in Urochordata. Discuss its peculiar systematic position and affinity with invertebrates. (20) Q:-2 Give the affinity and characteristic features of Balanoglossus. (15) Q:-3 What is neurotransmitter? Explain is signalling mechanism. Describe various types of signalling molecules. (20) Q:-4 What is apoptosis? Describe the role of Bcl-2 family in apoptosis. How mitochondria is regulating process of apoptosis? (15+5) Q:-5 Discuss the implications of impaired signalling pathways. How biotechnology can play a role in it? Describe any one common congenital disorder due to impaired functioning of Signalling pathway. (20)

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Q:-1 Describe the general characters of Phylum Echinodermata and classify the phylum upto subclasses. (20) Q:-2 What is repressor? Explain the trp operon and compare it with lac operon. (20) Q:-3 What is chromatin modification? How it is mediated? Discuss its role in gene regulation. (15) Q:-4 Describe the various larval forms in phylum Echinodermata. Explain their significance also. (20) Q:-5 What is water vascular system? Briefly explain the mechanism of respiration in Echinodermata. (15)

Q:-1Discuss the general features and life history of Pila with suitable diagrams. (20) Q:-2 Explain the process of torsion and detorsion in Gastropods. Discuss its significance and implications on physiology. (15) Q:-3 Compare the life history of Sepia and Lamellidens. (20) Q:-4 With diagrams explain the process of whole animal cloning. Describe various methods of making hybrid organisms. (15) Q:-5 What is transgenic organism? Discuss its significance in modern day society. (15)

Q:-1What is restriction enzymes? Discuss its various types and explain its nomenclature by taking suitable examples. (15) Q:-2 Give the general characteristics of phylum Mollusca and classify the phylum upto sub classes. (20) Q:-3 Comment on feeding habit of Mollusca. How it is different from Feeding habit of Echinodermata. (20) Q:-4 What is genetic library? Compare between cDNA and DNA library. (10) Q:-5 Explain the process of making the recombinant DNA. Describe the various types of DNA vectors and explain which one is better and why? (15) Q:-6 Explain the respiration process in classes of Mollusca with suitable diagrams. (15)