Unit 5: The Evolutionary History of Diversity Extras  Study Guide

Chapter 26 9 Review
  1. is the study of the evolutionary history and relationships of organisms.
  2. Carolus Linnaeus introduced a system of , for classifying species in seven hierarchical categories (taxa).
  3. Phylogenetic relationships are shown as branching trees where a branch point represents the divergence of two when they shared a common (homology).
    • similarity can be misleading due to evolution.
    • homologies can reveal many relationships not attainable by other methods.
  4. Shared ancestry and shared characters are drawn on a to show evolutionary relationships; this practice is called .
  5. A clade must be , and consists of the species and all its descendants.
  6. The tree of life is divided into three great clades called : (Monera), , and . _act_26&C
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