Inheritance in Biology — DU B.Sc. (Hons.) Botany Previous Year Question Papers

(iii) Testicular feminization (iv) Petite mutations in Saccharomyces cerevisiae 4. (a) Explain with the help of diagrams the process of cytoplasmic segregation and basis of variegation in leaf colour of Mirabilis jalapa. (7) (b) What is linkage? How does linkage differ from independent assortment of genes? Also explain the fact behind recombination frequency never exceeds beyond 50%. Distinguish between complete and incom.plete linkage. (8) 5. (a) Enlist the categories oftransposons by transposition mechanism and explain the role of transposons in mutations. (6) (b) Explain DNA fingerprinting as a molecular signature for unique identity establishment, conservation and finding adulterants in drugs. Group Generic Elective) 2. Attempt four questions in all including question no.1 1. (a) Define the following (Any five) (5x1=5) (i) Polygenic Inheritance (iti) Bar bodies (vi) Lethal genes (vii) Wild-type phenotype (b) Expand the following (Any five) (5x1=5) (c) Write major contribution (any five) (5x1=5) (iv) Alec Jeffreys (v) Alfred Sturtevant 2. Differentiate between any five: (5x3=15) (i) Dominance vs Epistasis (ii) Spontaneous vs Induced mutations (iii) Cut and paste vs replicative transposons (iv) Penetrance vs Expressivity (v) Chromosomal vs Molecular diagnosis of human diseases (vi) Codominance vs incomplete dominance Write short notes on any three of the following: (i) Multiple allelism