BIOL 1911 Chapter 26: 26.1 and 26.2 - Phylogenies show evolutionary relationships; Phylogenies are inferred from morphological and molecular data
12 Feb 2018
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Phylogeny the evolutionary history of a species or group of species. Systematics discipline focused on classifying organisms and determining their evolutionary relationships. Evolutionary history can be used to learn a lot about a species because organism share many characteristics as a result of shared ancestry. Binomial nomenclature classifies species according to its genus. Classifying species is a way of structuring our human view of the world. The placement of species into orders, classes, etc. does not necessarily reflect evolutionary history. Phylogenetic tree a branching diagram that represents the evolutionary history of a group. Organisms are regularly reclassified to accurately reflect its revolutionary history and correct previous mistakes. Some systematisms propose that classification can be based entirely on evolutionary relationship. What we can and cannot learn from phylogenetic trees. A phylogenetic tree is hypothesis about evolutionary relationships. Relationships are depicted as a series of dichotomies (two-way branch points)
