Zoology Exam II 2011/2012 - Questions & Instructions, Exams of Zoology

Download Zoology Exam II 2011/2012 - Questions & Instructions and more Exams Zoology in PDF only on Docsity! Semester II Examinations 2011/2012 Exam Code(s) 4BS2 Exam(s) 4th Undenominated Science Module Code(s) Z0409 Module(s) Evolutionary and Developmental Zoology Paper No. I External Examiner(s) Professor M. Davies Internal Examiner(s) *Professor W. Arthur Dr. U. Frank Dr. G. McCormack Dr. G. Schlosser Instructions: Answer four questions Duration 3hrs No. of Pages 2 Department(s) Zoology 1. Discuss and inter-relate the following: Homeotic transformation, homeotic mutation, selector gene, Hox gene, segment identity. Include in your answer an account of the evolution of body form through changes in the expression pattern of a Hox gene. 2. Give an account of the concept of gene co-option. Explain its link with convergent evolution, both in general and in the specific context of the evolution of animal limbs. 3. Cell fate stability is supported by epigenetic factors. What is the mechanistic role of these factors in stem cells and in differentiated cells? Give an example of an epigenetic modification and indicate under which circumstances and for what purpose it changes. p.t.o.