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)
- Define Genes
- What is test Cross?
- Define Muton.
- Mention the role of Stop codons.
- What is Thymine Dimer?
- What are Mutagens?
- Define emasculation.
- What is mass selection?
- Enumerate the Principles of Darwinism.
- 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)
- (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.
- (a) Describe the structure of a DNA.
(OR)
(b) Explain the steps involved in post transcriptional modification.
- (a). What is ploidy? Briefly explain allopolyploidy with examples.
(OR)
(b). Write short notes on any two types of chromosomal aberrations.
- (a). Enumerate the main objectives of plant breeding.
(OR)
(b). Give an account on pure line selection and its importance.
- (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)
- Discuss cytoplasmic inheritance with the help of suitable examples.
- Explain the steps involved in translation of mRNA in to polypeptide chain.
- Write notes on the mechanism of DNA repair.
- What is hybridization? Explain the types and steps involved.
- Give a detailed account on the concept of speciation and isolation according to synthetic theory.
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