BIO2 - March 5, The Tree of Life, Reconstructing Phylogeny...

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March 5, The Tree of Life, Reconstructing Phylogeny What is a phylogeny? Measuring evolutionary relationships Why do we care? Illustrates organisms united by shared ancestry and this ancestry can be thought of as a tree, it is useful for: -Understanding diversity and evolution. -Identifying, classifying, and categorizing differences and making classifications -Human Health, how avian flu originated in birds but can jump to humans and pigs -Phylogeny allows us to recognize the source and transmission How can we reconstruct the tree of life? Analysis of Fossils Compare similarities of organisms Nearest relatives don’t always look the most similar, there are three reasons animals may appear to be related Convergent Similarity Independent appearance of a characteristic in two different lineages (i.e. wings appear in bats and birds) Ancestral Similarity Mammals and birds have a common ancestor being lizards and both have related body coverings, feathers and hair on mammals being a type of modified scales
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This note was uploaded on 04/07/2008 for the course BSCI 106 taught by Professor Porter during the Spring '08 term at Maryland.

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BIO2 - March 5, The Tree of Life, Reconstructing Phylogeny...

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