TNAU Qualifying Exam 2014 GPB (Question Paper )

    

Part A

Write short notes on any Ten questions (4 Marks each — 10x4 = 40 Marks)

1. How does recurrent selection ensure increased frequency of desirable alleles governing economic traits in breeding populations?
2. Explain the procedure for conservation of agronomically ideal governing economic traits in breeding populations.
3. Explain the steps involved in Southern blotting technique.
4. Explain how monosomic alien addition lines are developed, taking examples of wheat and rye.
5. Interpret different genetic parameters that could be estimated using numerical and combining ability analysis of data from the progeny obtained by diallel mating design.
6. Differentiate qualitative and quantitative traits.
7. Explain theories of heterosis.
8. Explain homomorphic self-incompatibility.
9. Nobilization of canes.
10. Discuss the role of floral traits for improvement of crop-pollinator relationship.
11. What is marker-assisted selection (MAS)? Explain the principles and limitations of MAS.

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Part B

Write detailed answers to any Six questions (10 Marks each — 6x10 = 60 Marks)

1. Write on different physical mutagens used along with their merits and demerits.
2. What are the important steps involved in the development of hybrids? How are newly developed inbreds evaluated for combining ability?
3. Discuss the role of markers for increasing efficiency of PGR conservation and management.
4. Describe marker-assisted backcross breeding.
5. Illustrate the procedure for reciprocal recurrent selection.
6. Explain the utility of DNA marker systems in plant breeding.
7. Differentiate between maternal effect and maternal inheritance with a classical example.