<p><strong>Fig. 1.17.</strong> Phylogenetic trees show evolutionary relationships between species or other groups of organisms. A sample monophyletic group of monkeys, apes, humans, and their last common ancestor (red dot) is highlighted in yellow. A second potential monophyletic group could include those in yellow as well as the tarsiers and the last common ancestor of this larger group (blue dot).</p>

Fig. 1.17. Phylogenetic trees show evolutionary relationships between species or other groups of organisms. A sample monophyletic group of monkeys, apes, humans, and their last common ancestor (red dot) is highlighted in yellow. A second potential monophyletic group could include those in yellow as well as the tarsiers and the last common ancestor of this larger group (blue dot).

Image by David Lin, courtesy of Lexicon, Alex Dunkel, Kalyan Varma, Steven G. Johnson, Muhammad Mahdi Karim, Brocken Inaglory, and Peter Coxhead from Wikimedia Commons, and motoz from Flickr