GPB 507 Mid-Term Examination M.Sc. (Agri.) Semester-II (2017–18)

UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Department of Genetics and Plant Breeding
College of Agriculture, Raichur
Mid-Term Examination M.Sc. (Agri.) Semester-II (2017–18)
Course No.: GPB–507  Time: 1 hour  Total Marks: 25

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Q1. Define the following terminology (2.5 Marks)

1. Combining ability

2. T × E interaction

3. G × E interaction

4. Outbreeding

5. Pseudodominance

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Q2. Differentiate between the following (6.0 Marks)

1. Dominance hypothesis and overdominance hypothesis

2. Male sterility and incompatibility

3. Two-line and three-line system

4. Single cross hybrid and single cross hybrids in maize

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Q3. Answer the following (1.5 Marks)

1. How do you identify male sterile line before flowering in field?

2. Which male sterile line is used widely and why in crop plants?

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Q4. Describe in brief (8.0 Marks)

1. Chemical hybridizing agents

2. Types of male sterility

3. Combining ability

4. Line × Tester analysis

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Q5. What do you mean by inbreeding depression? What are the effects of ID? (2.5 Marks)

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Q6. How do you fix the heterosis? What are the factors affecting the heterosis? (2.5 Marks)

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Q7. Give the important features of outbreeding in heterosis. (2.0 Marks)