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)
- Incomplete dominance
- Test cross
- Cistron
- Transposable elements
- Chemical mutagens
- 21 trisomy
- Centres of origin
- Heterosis
- Speciation
- Neo Lamarckism
PART-B
Answer the following, each within 500 words, draw diagrams wherever necessary:
(5×7=35 marks)
- a) Explain multiple alleles with one example.
(OR)
- b) Give an account of quantitative inheritance.
- a) Explain genetic code.
(OR)
- Explain genetic recombination using neurospora tetrad formation.
- a) Write about chromosomal abbreations.
(OR)
- b) Distinguish between auto and allopolypoidy.
- a) Give an account on types of selection.
(OR)
- b) Discuss the origin of cultivated plants.
- a) Write a note on origin of species.
(OR)
- 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)
- Describe sex determination in plants.
- Discuss the gene regulation in prokaryote.
- Explain the steps involved in hybridization.
- Write a detailed account of DNA repair mechanism.
- Explain natural selection and its role in evolution.
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