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Discussion 1 - CELL BIOLOGY(BIO 320 Fall 2009 Discussion 1...

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CELL BIOLOGY (BIO 320) Fall 2009 Discussion 1 - Key _______________________________________________________ 1. What evidences(s) would you use to support the argument that all living organisms arose from a common ancestor? List as many as you can. In case, you believe that all living organisms did not arise from a common ancestor, then provide evidence(s) to support this viewpoint. 2. How many possible different trees (branching patterns) can be drawn for eubacteria, archaea, and eucaryotes, assuming that they all arose from a common ancestor? Four. All could have split from the common ancestor at the same time. Eubacteria- archaea could have split from eukaryotes, followed by the separation of eubacteria from archaea. Eubacteria-eucaryotes could have split from archaea, followed by the separation of eubacteria from eucaryotes. Archaea-eucaryotes could have split from eubacteria, followed by the separation of archaea from eucaryotes. Although horizontal transfers across these divisions make interpretations problematic, it is thought that archaea-eucaryotes first split from eubacteria, and then archaea split from eucaryotes. The four possible relationships for the evolution of Archaea (A), Eubacteria (B), and Eucaryotes (E). 3. You are interested in finding out the function of a particular gene in the mouse genome. You have sequenced the gene, defined the portion that
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