Autumn Examinations 2007/2008: Zoology Exam Questions, Exams of Zoology

Download Autumn Examinations 2007/2008: Zoology Exam Questions and more Exams Zoology in PDF only on Docsity! Autumn Examinations 2007 / 2008 Exam Code(s) 3BS, 3MR Exam(s) Third Undenominated Science, Third Marine Science Module Code(s) Z0313 Module(s) Evolutionary Developmental Zoology Paper No. I External Examiner(s) Professor C. Holland Internal Examiner(s) Professor W. Arthur *Dr. G. McCormack Dr. U. Frank Instructions: Answer 4 questions Duration 3 hrs No. of Pages 2 Department(s) Zoology 1. Answer both parts A) In an electrophoretic study of enzyme variation in a species of grasshopper, you find 62 A1A1, 49 A1A2 and 9 A2A2 individuals in a sample of 120. Show that p=0.72 and q=0.28, and that the genotype frequencies of A1A1, A1A2 and A2A2 are approximately 0.51, 0.41 and 0.08 respectively. Demonstrate that the genotype frequencies are in Hardy-Weinberg equilibrium. B) List the assumptions of the Hardy-Weinberg Law and briefly describe how they are often violated in nature. Table of Chi-squared values, d.f. = degrees of freedom. Probability of a larger value of 2 d.f. 0.10 0.05 0.01 0.001 1 2.7 3.8 6.6 10.8 2 4.6 6.0 9.2 13.8 3 6.3 7.8 11.3 16.3 4 7.8 9.5 13.3 18.5 5 9.2 11.1 15.1 20.5 6 10.6 12.6 16.8 22.4 8 13.4 14.1 20.1 26.1 10 16.0 18.3 23.2 29.6 12 18.5 21.0 26.2 . 32.9 20 28.4 31.4 37.6 45.3 25 34.4 37.7 44.3 52.6