Acharya Nagarjuna University (ANU) 2005 M.Sc Information and Communication Technology CYTOLOGY, GENETICS AND PLANT BREEDING - Question Paper

M.Sc. (Previous) DEGREE EXAMINATION,
DECEMBER 2005.
First year
Botny
Paper III - CYTOLOGY, GENETICS AND PLANT BREEDING

Time : 3 hours Maximum : 100 marks

ans any 5 ques. from part A.
every ques. carries eight marks.
ans ALL ques. from part B.
every ques. carries 15 marks.
part A - (5x8=40 marks)

1. Heterochromatin.
2. Synaptinemal complex.
3. Lamp-brush chromosomes.
4. Amphidiploids.
5. Complementary gene action.
6. Cytoplasmic male sterility.
7. Inportance of plant introduction.
8. Recurrent selection.

part B - (4x15=60 marks)

9. (a) define the ultra structure of nucleolus and its organization; how is it involved in the synthesis of r-RNA.

Or

(b) What is a karyotype? How is it studied? Add a note on the significance of banding techniques in it.

10. (a) Write briefly on the various inversion heterozygotes and their meiotic behaviour.

Or

(b) elaborate autopolyploids? explain on the meiotic behaviour of an autotriploid.

11. (a) Write an essay on the chromosomal theory of sex determination in plants and animals.

Or

(b) What is a mutagen and how are they classified? define the mode of action of any 2 mutagens you have learned.

12. (a) Write briefly on the breeding methods of self pollinated crop.

Or

(b) What is hybridization? define the methods used in plant breeding with their signigicance.

Earning:   Approval pending.