LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

FIFTH SEMESTER – NOVEMBER 2010

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

 

 

 

Date : 01-11-10                     Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

PART – A (20 marks)

      Answer ALL questions.

 

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

 

1. Cross  of  F₁  individual with the recessive parent is known as a cross.
2. a)  test            b) back                c) dihybrid                       d) Monohybrid
3. Which of the following are the stop codons?
4. a) UAA ,UGA , UAG  b)UCC, UAA,UCA  c)UAA, UAG,UCA  d) UAA, UAC, UCA
5. The genetic condition of   individuals with Klienfelter’s syndrome is
6. a) XYY           b) XXX               c) XXY                  d) XY
7. The term heterosis was coined by
8. a) Bruce         b) Shull               c) Nilsson             d) Johannsen
9. Charles Darwin went on a voyage on a ship named
10. a) HMS Eagle b) HMS Beagle         c) HMS Bugle        d) HMS Titanic

 

1. State whether the following statements are True or False (5×1=5)

 

1. Cytoplasmic male sterility in maize is attributed to the female parent.
2. The start codon AUG codes for Methionine.
3. Transition is a base change that changes the Pyrimidine – Purine orientation.
4. Heterosis results from the crossing of genetically unlike organisms.
5. Mutation does not play a part in evolution.

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

 

11. Lethal genes in plants  was first reported in __________.
12. Negative superhelicity in E.coli DNA is brought  about  by the enzyme ____
13. ___________   coined  the term mutation.
14. The progeny of a single cross- pollinated plant obtained by selfing is  called

_____________.

 

15. Inorganic evolution explains the changes that take place in _________.

 

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

 

16. Define an Allele
17. What is Genetic code?
18. Write about Point mutation.
19. Write short notes on Emasculation.
20. What is Speciation?

 

PART – B

 

Answer the following, each answer within 350 words . Draw diagrams wherever necessary.

 

(5X7=35marks)

 

21. a) Explain the second law of Mendel using a dihybrid cross.

(OR)

1. b) With a suitable example, explain Incomplete dominance in plants.

 

22. a) How is the hnRNA post transcriptionaly modified into a homogenous mRNA?

(OR)

1. b) Explain regulation of gene expression in coli.

 

23. a) What is polyploidy ? Briefly explain auto polyploidy and allopolyploidy.

(OR)

1. b) Explain the different types of chromosomal aberrations.

 

24. a) List out the positive and negative effects of heterosis.

(OR)

1. b) What are the various steps involved in hybridization procedure to obtain F1 generation?

 

25. a) Discuss the theory of natural selection.

(OR)

1. b) Critically comment on Neo-Lamarckism.

 

 

PART – C

 

Answer any three of the following, each answer within 1200  words .

Draw diagrams wherever necessary.                                                                             (3×15=45marks)

 

26. What is polygenic inheritance ? With the help of  a  Punnet square explain the

inheritance of kernel colour in wheat.

27. Enumerate the process of replication of DNA with suitable diagrams.
28. Explain in detail the different light –independent DNA repair mechanisms.
29. Discuss the methods of mass and pure line selection.
30. Write an essay on mutation theory and synthetic theory.

 

 

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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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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

FIFTH SEMESTER – APRIL 2012

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

 

 

 

Date : 27-04-2012              Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART-A

 

Answer the following, each within 50 words:                                     (10 x 2 =20marks)

 

1. Incomplete dominance
2. Test cross
3. Cistron
4. Transposable elements
5. Chemical mutagens
6. 21 trisomy
7. Centres of origin
8. Heterosis
9. Speciation
10. Neo Lamarckism

PART-B

 

Answer the following, each within 500 words, draw diagrams wherever necessary:      

                                                                                                                                    (5×7=35 marks)

 

11. a) Explain multiple alleles with one example.

(OR)

1. b) Give an account of quantitative inheritance.

 

12. a) Explain genetic code.

(OR)

1. Explain genetic recombination using neurospora tetrad formation.

 

13. a) Write about chromosomal abbreations.

(OR)

1. b) Distinguish between auto and allopolypoidy.

 

14. a) Give an account on types of selection.

(OR)

1. b) Discuss the origin of cultivated plants.

 

15. a) Write a note on origin of species.

(OR)

1. b) Explain Lamarckism and its role in evolution.

 

 

PART-C

 

Answer any Three of the following, each within 1200 words only;

Draw diagrams and flowchart wherever necessary:                                     (3×15=45)

 

16. Describe sex determination in plants.
17. Discuss the gene regulation in prokaryote.
18. Explain the steps involved in hybridization.
19. Write a detailed account of DNA repair mechanism.
20. Explain natural selection and its role in evolution.

 

 

 

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LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

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

FIFTH SEMESTER – NOVEMBER 2012

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

 

 

 

Date : 03/11/2012             Dept. No.                                        Max. : 100 Marks

Time : 9:00 – 12:00

 

PART – A

 

ANSWER THE FOLLOWING, EACH WITHIN 50 WORDS ONLY:                     (10x 2=20 marks)

 

1. Define Genes
2. What is test Cross?
3. Define Muton.
4. Mention the role of Stop codons.
5. What is Thymine Dimer?
6. What are Mutagens?
7. Define emasculation.
8. What is mass selection?
9. Enumerate the Principles of Darwinism.
10. What is a gene pool?

PART – B

 

ANSWER THE FOLLOWING, EACH ANSWER WITHIN 500 WORDS,

DRAW DIAGRAMS, FLOW CHARTS WHEREVER NECESSARY:                             (5 X 7 = 35 marks)

 

11. (a) Compare and contrast incomplete dominance and co dominance with suitable examples.

(OR)

(b)        With the help of a checker Board explain law of independent assortment.

 

12. (a) Describe the structure of a DNA.

(OR)

(b)        Explain the steps involved in post transcriptional modification.

 

13. (a).      What is ploidy? Briefly explain allopolyploidy with examples.

(OR)

(b).       Write short notes on any two types of chromosomal aberrations.

 

14. (a). Enumerate the main objectives of plant breeding.

(OR)

(b). Give an account on pure line selection and its importance.

 

15. (a). Briefly explain  mutation theory.

(OR)

(b). Explain Lamarck’s theory of organic evolution.

 

PART – C

 

ANSWER ANY THREE OF THE FOLLOWING, EACH WITH IN 1200 WORDS;

DRAW DIAGRAMS, FLOWCHARTS WHEREVER NECESSARY:                            (3 X 15 = 45 marks)

 

 

16. Discuss cytoplasmic inheritance with the help of suitable examples.

 

17. Explain the steps involved in translation of mRNA in to polypeptide chain.

 

18. Write notes on the mechanism of DNA repair.

 

19. What is hybridization? Explain the types and steps involved.

 

20. Give a detailed account on the concept of speciation and isolation according to synthetic theory.

 

 

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