Ch 27 notes - Ch 27- Phylogenies and the History of Life...

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Ch 27- Phylogenies and the History of Life Phylogenies - the evolutionary history of a group of organisms Phylogenetic tree - the ancestor-descendant relationships among populations or species, and clarifies who is related to whom. Branch - represents a population through time Node - the point where two branches diverges that represents the point in time when an ancestral group split into two or more descendant groups Tip (or terminal node)- the endpoint of a branch that represents a group living today or one that ended in extinction Phenetic approach - a method for constructing a phylogetic tree by computing a statistic that summarizes the overall similarity among populations, based on the available data e.g. overall “genetic distance” between two populations Cladistic approach - a method for constructing a phylogenetic tree that is based on identifying the unique traits of each monophyletic group Synapomorphies
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Ch 27 notes - Ch 27- Phylogenies and the History of Life...

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