DISTANCE EDUCATION
M.Sc. (Botany) (Specialization Plant Bio-technology)
DEGREE EXAMINATION, MAY 2018.
CELL BIOLOGY, GENETICS AND PLANT BREEDING
(2008 onwards)
Time Three hours Maximum 100 marks
Answer any FIVE questions.
Each question carries 20 marks.
x 20 100)
1. Explain the structure of mitochondrion and its
functions.
Discuss the organization and functions of
microtubules and microfilaments.
Explain the structure of golgi bodies and add a note
on its functions.
2. With suitable illustration, explain the structure of
nucleus.
Highlight the stages of Mitosis.
Explain the structure of a prokaryotic cell.
Sub. Code
22
DE-4081
2
SP 5
3. Explain the composition and structure of biological
membrane.
Comment on 'Interphase' and add a note on the
significance of mitosis and meiosis.
Briefly explain the mechanisms involved in the
transport of ions and molecules across the
membrane.
4. Give an account of non-epistatic genetic
interactions.
Explain complete and incomplete linkage giving one
example each.
Write a brief note on male sterility in plants.
5. Discuss the mechanism of meiotic crossing over.
Explain Mendel's law of segregation giving a
suitable example.
Define 'Prion'. Add a note on its induction and
applications.
6. What is meant by aneuploidy? Explain its causes.
Elaborate on the types of structural changes in
chromosomes.
State 'Hardey Weinberg's Law'. Explain its
applications in calculating gene frequencies in a
population.
DE-4081
3
SP 5
7. Define 'Hybridization' and explain its types giving
suitable examples.
Describe the breeding methods in cross pollinated
crops.
Discuss the objectives of plant breeding.
8. Explain the methods of plant breeding for stress
tolerance.
Define the term 'Heterosis' and add a note on its
effects.
Discuss the applications of mutation breeding in
crop improvement.