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| Description: An unrooted tree illustrates the evolutionary relationships among the proteobacteria, a large group of bacteria including human- associated species such as E. coli and nitrogen- fixing species such as A. tumefaciens. Here we do not have enough information to say whether, for example, interior node A represents a more recent or less recent population than does interior node B. Adapted from Shin et al. (1993). Picture Stats: Views: 1092 Filesize: 156.94kB Height: 900 Width: 1317 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=5291 |