Loyola College B.Sc. Plant Biology and Biotechnology April 2012 Genetics, Plant Breeding And Evolution Question Paper PDF Download

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)

 

  1. a) Explain multiple alleles with one example.

(OR)

  1. b) Give an account of quantitative inheritance.

 

  1. a) Explain genetic code.

(OR)

  1. Explain genetic recombination using neurospora tetrad formation.

 

  1. a) Write about chromosomal abbreations.

(OR)

  1. b) Distinguish between auto and allopolypoidy.

 

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

(OR)

  1. b) Discuss the origin of cultivated plants.

 

  1. 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)

 

  1. Describe sex determination in plants.
  2. Discuss the gene regulation in prokaryote.
  3. Explain the steps involved in hybridization.
  4. Write a detailed account of DNA repair mechanism.
  5. Explain natural selection and its role in evolution.

 

 

 

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