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Unformatted text preview: lineages of organisms appear. The sequence of base pairs in individual molecules of DNA and RNA are used to track relationships. Organisms with similar sequences are assumed to have had a common ancestor, and the more alike the strings of base pairs, the closer is the relationship. By combining molecular data with the information already known about organisms, biologists construct phylogenetic trees like that shown in Figure 1 . Most, but not all, biologists agree that at present this is the best way to arrange the branches, but new data undoubtedly will require new interpretations and, perhaps, different phylogenetic trees....
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.
- Fall '08