M.Sc-M.Sc Botany 1st Year Paper - III : CYTOLOGY, GENETICS AND PLANT BREEDING (Acharya Nagarjuna University - Center for Distance Education, Guntur, Andhra Pradesh-2013)

(DBOT 03) NR M.Sc. (Previous) DEGREE EXAMINATION, MAY - 2013 
First Year 
Botany 
Paper - III : CYTOLOGY, GENETICS AND PLANT BREEDING 

Time : 03 Hours                                                                            Maximum Marks : 80

Section - A (5 × 8 = 40) 

Answer any Five of the following 

1) Telomere. 
2) Karyotype evolution. 
3) Ecaploids. 
4) Heterozygotes. 
5) Pseudoalleles. 
6) Chi-square test. 
7) Pedigree method. 
8) Mass selection. 
Section - B (4 × 10 = 40) 
Answer All of the following 9) a) Describe the differences between prokaryotic and eukaryotic cells. 
OR 
b) Describe the chromosome structure and packing of DNA. 10) a) Explain the origin, occurrence, production and meiosis of haploids. 
OR 
b) Describe the evolution of major crop plants. 11) a) Describe the sex determination mechanisms in plants and animals. 
OR 
b) Explain the role of mutations in plant breeding. 12) a) Describe the role of hybridization in plant production and yield. 
OR 
b) Describe the clonal selection and back cross method. 
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