Nalanda Open University
Annual Examination 2016
B.Sc. Botany (Honours), Part-III
Paper-VIII (Genetics)
Time: 3.00 Hrs. Full Marks: 80
Answer any five questions. Questions No. 1 is compulsory. All questions carry equal marks.
1. Multiple choice questions
A ratio of 9 3 3 1 is modified due to inhibitory factor to
15 1 13 3 9 6 1 12 3 1
Additive factor or polymerism contains modified ratio as
1 4 6 4 12 3 1 9 3 4 9 6 1
A trisomic individual has a chromosome number of
2n 1 2n 2 2n 1 2n 3
The genetic information is coded in the form of
ATP DNA Histone Protein
gene altogether constitute a set of
15 genes 20 genes 30 genes 50 genes
Which is an example of cytoplasmic inheritance?
Flower colour in Pea Sterile pollen
Eye colour in Drosophila Height in pea
Turner's syndrome is due to
Monosomy Tetrasomy Nullisomy Trisomy
(viii) Which one of the following techniques is used by forensic scientist in
the detection of crime?
DNA finger printing DNA nicking
DNA sequencing Gene therapy
2. Write about the lethal factors? How do the lethal factors modify the
monohybrid ratio?
3. Explain genetic code and describe the characteristics of genetic code.
4. Define mutation and discuss its role in crop improvement.
5. Give an account of PCR methodology for gene amplification.
6. Define the interaction of gene. Explain the polygenic inheritance in wheat.
7. Explain genetic counselling and describe its significance and role in human
life.
8. Describe the different tools employed in genetic engineering.
9. Discuss the aims and findings of human genome project.
10. Write notes on any Two of the following
Turner's Syndrome
Wobble hypothesis
Exonuclease
mRNA