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BIOL 142 Chapter 23 Study Guide for TEST 1

BIOL 142 Chapter 23 Study Guide for TEST 1 - A clade is an...

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BIOL 142: Study Guide for TEST # 1 Chapter 23 – Systematics and Phylogeny Systematics – the study of evolutionary relationships Phylogeny – a hypothesis about patterns of relationship among species – usually represented as “trees” In a phylogenetic tree : Movement up, away from the base of the tree represents evolutionary changes in time toward present day Twigs represent existing species Places where branches come together represent recent common ancestors The trunk of the tree represents the common ancestor to all branches.
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Unformatted text preview: A clade is an evolutionary unit referring to a common ancestor and all of its descendents (i.e., an entire, branch of the tree that is separate from other branches). Another way to describe a clade is as a monophyletic group . Groups that are NOT monophyletic can be: paraphyletic = does not include all of the descendents of a common ancestor polyphyletic = does not include the most recent common ancestor of members of the group...
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