Autumn Examinations 2009/2010: Evolutionary Developmental Zoology Exam Questions, Exams of Zoology

Download Autumn Examinations 2009/2010: Evolutionary Developmental Zoology Exam Questions and more Exams Zoology in PDF only on Docsity! Autumn Examinations 2009/ 2010 Exam Code(s) 3BS9, 3MR1, 3MR3 Exam(s) Third Undenominated Science, Third Marine Science Module Code(s) ZO313 Module(s) Evolutionary Developmental Zoology Paper No. 1 External Examiner(s) Professor M. Davies Internal Examiner(s) Professor W. Arthur Dr. U. Frank Dr. G. McCormack *Dr. A.M. Power Dr. G. Schlosser Instructions: Answer four questions, at least one per section. Duration 3 hours No. of Pages 2 Department(s) Zoology Section A (answer at least one). 1. Using frog development as an example, discuss the process of neural induction. Which experiment led to the discovery of neural induction and who performed it? What is currently known about the underlying molecular mechanisms? 2. The neural crest is a population of multipotent vertebrate cells. a) Explain how the neural crest originates during development. b) Describe which different fates neural crest cells adopt in the trunk and give examples of factors that influence these cell fate decisions. c) Explain how migration of neural crest cells in the trunk is regulated. 3. The experiments of Hubel and Wiesel on ocular dominance columns (ODCs) demonstrated a high degree of synaptic plasticity in the visual cortex of young kittens. Please explain their findings on monocularly and binocularly deprived cats and comment on the role of neural activity and competition in the establishment of ODCs.