GPB (501)(2+1) Principles of Genetics (Question Paper)

UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Department of Genetics & Plant Breeding, College of Agriculture, Raichur – 584 104
MT/GPB 501/2+1(Core)/Date: 29-12-2017/Max. Marks: 35

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I. Define the following: (10 marks)

1. Epistatic gene: 

2. Hypostatic allele:

3. Absolute linkage: 

4. Crossing over: 

5. Recombinant type: 

6. Map distance: 

7. Pleiotropy:

8. Karyotype: 

9. Unfavourable linkage:

10. Saturation of maps:

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II. Differentiate the following: (10 Marks)

1. 12:3:1 with 15:1

2. 7:1:1:7 with 9:3:3:1

3. Morgan with Sturtevant

4. Linkage maps with Cytological maps

5. 0.01cM with 12cM

6. AaBb with Aa/Bb

7. Linkage group of female Drosophila with male human

8. 9:6:1 with 9:7

9. Dominance with Epistatic interaction

10. F2 phenotypic ratio of 6:2:3:1 with 1:2:1:2:4:2:1:2:1

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III. Answer the following: (15 marks)

1. What are non-epistatic interactions? How they arise. With an example explain.

2. What are the properties of linkage? How these properties can be used in breeding?

3. Discuss inhibitory interaction for two and three gene cases. What would dominant epistasis and recessive epistasis for three gene case.

4. How linkage can be detected. Explain.

5. Write short notes on:
   a. Linkage detection using pedigree chart
   b. Gene isolation using linkage analysis
   c. Penetrance and Expressivity