Genetics and Plant Breeding I (Principles of Genetics and Cytogenetics)

Daffodil International University Department of Agricultural Science Faculty of Agriculture BSc. in Agricultural Science Final Examination-Summer 2026 Course Code: 0818-2201 Course Title: Genetics and Plant Breeding -I (Principles of Genetics and Cytogenetics) Level and Term: L-2, T-2 Section: 251 (A & B) Course Teacher Initials: MAS & MAR Time: 2 Hr Total Marks: 40 Splitting any answer is strictly prohibited 1 (a) Explain the key events of pachytene and anaphase I with proper diagram. (PLO1,CLO1, C2) 5 (b) Explain the significance of meiosis in sexually reproducing organisms. (PLO1,CLO1,C2) 3 2 (a) Define mutation and mutagen. Mention the characteristics of mutation. (PLO2,CLO2,C1) 5 (b) List different types of mutagens. (PLO2,CLO2,C1) 3 3 (a) In a plant, red flower color is incompletely dominant over white flower color. Apply the principle of incomplete dominance to determine the phenotypic and genotypic ratio of the F2 generation from a cross between red-flowered and white-flowered plants. (PLO1,CLO3,C3) 5 (b) Apply the concept of chromosomal translocation using two non-homologous chromosome segments and show how gene arrangement changes after segment exchange. (PLO2,CLO3,C3) 3 4 (a) A diploid plant has 2n = 6 chromosomes (B1B1B2B2B3B3). Apply the concept of aneuploidy to show the chromosome number of monosomic, nullisomic, and trisomic conditions. (PLO2,CLO4,C3) 5 (b) A diploid organism has lost one chromosome from a homologous pair. Identify the condition, write its formula, and mention cytogenetic consequence. (PLO1,CLO4, C3) 3 5 (a) Analyze the F2 phenotypic classes of a dihybrid cross involving duplicate dominant genes and explain how the ratio 9:3:3:1 is modified into 15:1. (PLO5,CLO3,C4) 5 (b) Diagrammatically show the relationship among Brassica sp. (PLO1,CLO5,C4) 3