Lecture 1.docx

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Biological Sciences
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Rahul Warrior

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Lecture 1 Synapomorphy – shared derived trait in 2 or more taxa that was present in their common ancestor and missing further back • Cladogram = type of evolutionary tree built on “cladistic” principles • Synapomorphies  Parsimony – method that implies as few evolutionary steps as possible  Coherence – trees built using different synapomorphies should agree Theory vs. hypothesis • Theory (def): a proposed explanation for a very general class of phenomena. Hypothesis: a proposed explanation for a phenomenon or a set of observations. H1: Giraffes with the
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