Concepts of Evolutionary Ecology — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

5. (a) Discuss about different types of genetic variations and their role in evolution. (9) (b) Differentiate between the phylogenetic species concept and ecological species concept. (6) 6. Write short notes on any three of the following : (a) Migration and Mutation (b) Camouflage and Mimicry (c) Origin and Evolution of Insects (d) Geological time Scale (3×5=15) Attempt four questions in all. Draw well labelled diagrams wherever required. 1. (a) Define (Any five) : (1×5=5) (iii) Sexual Selection (iv) Ring Species (v) Genetic Load (vi) Genetic drift (b) Differentiate between the following (Any three) : (iii) Artificial selection can lead to rapid evolutionary changes. (iv) The K-T extinction event was a turning point in evolutionary history. 2. (a) Describe the different types of natural selection with suitable examples. (9) (b) Critically analyze the endosymbiotic theory in light of molecular phylogeny. Are there alternative explanations for organelle origin? (6) 3. (i) Darwinism and Neo-Darwinism (ii) Microevolution and Macroevolution (iii) Founder’s Effect and Bottleneck Effect (iv) Oxygenic vs Anoxygenic Photosynthesis (c) Justify the following : (1×4=4) (i) Fossils are strong evidence for evolution. (ii) The importance of the geological time scale in studying evolution. (a) Discuss the different modes of speciation with suitable examples. (9) (b) Critically analyze the multiple hypotheses for the K-T extinction and discuss their combined effects on global ecosystems. (6) 4. (a) Briefly explain the isolating mechanisms of animals in details. (9) (b) Differentiate between the biological species concept and evolutionary species concept. (6)