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Chapter 25 Notes - Chapter 25 Phylogeny and Systematics...

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Chapter 25 Phylogeny and Systematics Investigating the Tree of Life 1. A Phylogeny is the evolutionary history of a species or group of related species 2. To uncover phylogenies , biologists use systematics o Systematics - an analytical approach to understanding the relationships of organisms, both present-day and extinct. Systematics makes use of many types of data 1. Fossil, morphological, biochemical, and molecular comparisons can all be used to infer evolutionary relationship 2. Well supported phylogenies are based on common ancestries inferred from multiple line of evidence The Fossil Record 1. Is a substantial, but incomplete record of evolutionary change 2. Biased in favor of organisms that existed for longer periods of time, were abundant and wide- spread, and possessed hard parts that were likely to fossilize 3. Can reveal ancestral characteristics that may have been lost over time 4. Inform us of the order of appearance of new characteristics Morphological and Molecular Homologies 1. Phylogenetic history can be inferred from morphological and molecular similarities among living organisms 2.
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