Trimester System, 2014 – Tamil Nadu Agricultural University GPB Qualifying Exams

 

M.Sc. (Agri.) – Principles and Limitations of Genetics and Plant Breeding

Trimester System, 2014 – Tamil Nadu Agricultural University
Maximum Marks: 100

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Part A

Write short notes on any Ten questions.
(4 Marks each = 10 × 4 = 40 marks)

1. How does economic selection ensure increased frequency of desirable alleles?

2. Genetic basis of population improvement and germplasm conservation.

3. Explain the concept of ergodicity and its importance in economic selection.

4. Explain how monosomic lines can be utilized in plant breeding (with example).

5. Interpret additive genetic parameters that could be estimated using current data.

6. Differentiate between ANOVA and diallel analysis.

7. Explain quantitative and qualitative traits.

8. Discuss role of heterosis in plant breeding.

9. Describe the role of floral traits in improvement of cross-pollinated crops.

10. Explain marker-assisted selection (MAS).

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Part B

Write detailed answers for any Six questions.
(10 Marks each = 6 × 10 = 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 the newly developed inbreds evaluated for combining ability and high yield?

3. Discuss the role of marker-assisted backcross breeding in improving efficiency of germplasm conservation and management.

4. Explain marker-assisted backcross breeding (MABC).

5. Illustrate the procedure for reciprocal recurrent selection.

6. Explain the role of DNA marker systems in plant breeding.

7. Differentiate between maternal effect and maternal inheritance with a classical example.