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| Description: Two competing hypotheses for the evolutionary relationships among mammalian groups: (A) Marsupials and placentals may be sister groups, or (B) marsupials and monotremes may be sister groups. (C) We can capture the uncertainty about the relationship among placentals, marsupials, and monotremes by representing the groups as a polytomy. Adapted from Meyer and Zardoya (2003). Picture Stats: Views: 1815 Filesize: 213.87kB Height: 741 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=5287 |