Questions_Phylogeny

Questions_Phylogeny - Questions for Microbial Diversity and...

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Unformatted text preview: Questions for Microbial Diversity and Phylogeny 1. Many of the microbial fossils found in 3.5-billion year old rocks show what appear to be multicellular chains of cells. Do you believe these structures could represent the structure of the very first life forms to have evolved? Explain why or why not. 2. Shown is a phylogenetic tree of the relationship of three organisms, A, B, and C. Which statement accurately describes the evolutionary relationship of organisms A and B based on this tree? A) A and B have evolved from a common ancestor and have evolved at the same rate. B) A and B have evolved from a common ancestor, and A has evolved more rapidly than B. C) A and B share a common ancestor, but their rates of evolution cannot be inferred from the tree. D) A and B share a common ancestor, and B has evolved more rapidly than A. E) A has evolved more rapidly that B, and they do not share a common ancestor. 3. Shown is a phylogenetic tree of the relationship of three organisms, A, B, and C. Remove organism C from this analysis and construct a new tree were based on the analysis of just A and B. Based on this new tree, which statement is a conclusion that could be drawn regarding the evolutionary relationship to A and B? A) A and B share a common ancestor, and B has evolved more rapidly than A. B) A and B share a common ancestor, and A has evolved more rapidly than B. C) A and B share a common ancestor, and their rates of evolution cannot be inferred from the tree. D) A and B do not share a common ancestor, and their rates of evolution cannot be inferred from the tree. E) It is not possible to know whether A and B share a common ancestor, and their rates of evolution cannot be inferred from the tree. 4. One criterion for choosing a gene on which to base the universal tree of life is that the gene be functionally homologous in all organisms. If the gene chosen was not functionally homologous: A) would the constructed tree reflect the evolutionary distance of organisms? B) would the constructed tree reflect a different parameter? If so, what would this different parameter be? ...
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