LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc. DEGREE EXAMINATION – PLANT BIOLOGY & PLANT BIO-TECH.

FIFTH SEMESTER – APRIL 2011

PB 5516/PB 5510/PB 5506 – GENETICS, PLANT BREEDING AND EVOLUTION

 

 

 

Date : 18-04-2011              Dept. No.                                                    Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A  (20 Marks)

 

Answer ALL questions                                                                                            

 

1. Choose the correct answer (5×1 = 5)

 

1. 12:3:1 ratio is due to
2. lethal gene                b.  epistatic gene       c.  hypostatic gene        d.  supplementary gene
3. The generation of a polypeptide chain on the basis of the information contained in

DNA template is called

1. transcription             b.  translation                        c.  transversion                          d.  transduction
2. A person with a karyotype XXY has
3. Turner’s syndrome               b.  Klinefelter’s syndrome.     c.   Edward’s syndrome                      d.  Cat-cry syndrome
4. The Central Rice Research Institute is at
5. Cochin                      b.  Chennai                  c.  Cuttack                               d.  Coimbatore
6. “Origin of Species” was written by
7. Mendel                    b.  Pasteur                  c.  Linnaeus                  d.  Darwin

 

1. State whether the following statements are true or false (5×1 = 5)

 

6. Reciprocal crosses yield different results in cytoplasmic inheritance.
7. Cytosine pairs with Thymine in DNA.
8. The term ‘mutation’ was coined by Hugo de Vries.
9. Water logging enhances the growth of cereal crops.
10. Evolution is influenced by natural selection.

 

III. Complete the following                                                                                                  (5×1 = 5)

 

11. Multiple alleles influence the same  _________________________
12. The first molecular biologist who visualised the replicating chromosome of E. coli

was ________________________

13. The chemical colchicine has the property to induce  ___________________
14. The Indian Institute of Sugarcane Research is at  ________
15. The Neo-Darwinism Theory was first proposed by______________________

 

1. Answer the following, each within 50 words (5×1 = 5)

 

16. Define Monohybrid Cross
17. Comment on Recon
18. What is Frame Shift Mutation?
19. Writes note on Heterosis
20. What is speciation?

 

 

 

 

PART – B

 

Answer all five questions, each within 500 words. 

Draw diagrams wherever necessary.                                                                      (5×7 = 35 marks)

 

21. a. Explain the inheritance of complementary genes

(OR)

1. Why has Mendel been called “The Father of Genetics”?

 

22. a. Describe genetic recombination using the life cycle of Neurospora crassa.

(OR)

1. Write a short note on Transposable elements in plants

 

23. a. Describe any one human genetic disorder.

(OR)

1. Mention the various physical and chemical mutagens.

 

24. a. Distinguish between clonal and pureline methods of selection.

(OR)

1. Comment on the principles, objectives and importance of plant breeding.

 

25. a. What is meant by Synthetic Theory?

(OR)

1. Highlight the important features of Mutation Theory

.

PART – C

.

Answer any THREE questions, each answer within 1200 words. 

Draw diagrams wherever necessary                                                                       (3×5 = 45 marks)

 

26. With the help of suitable examples, discuss the inheritance of multiple genes.
27. Explain the semi-conservative models of DNA replication.
28. Highlight the genetic significance of chromosomal aberrations.
29. Give a detailed account of hybridization techniques in plants.
30. Compare and contrast the Darwinism and Lamarckism Theories of Evolution.

 

 

 

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