BIOL 2400 Lecture Notes - Lecture 2: Viral Envelope, Tetrapod, Phylogenetics
16 Jan 2018
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Why do we want to infer past evolutionary events: generate testable hypotheses about, the evolutionary relationships among taxa, the order in which traits emerged, the role of environmental change in the origin of groups, origin of pathogens. You can be infected with more than one strain- that is why the dentist is listed twice. A, g, b, e and a got hiv from the dentist, the other patients were less likely to have gotten it from the dentist because they are not clustered. Internal node: nodes within a phylogeny represent ancestral species: branches: lineages evolving independently through time between speciation events, cladogram: phylogeny where time scale is not depicted. January 12th, 2018: you are related to your sister by a common ancestor. You are not derived from your sister or cousin: you have to use common ancestors to determine relations- this cannot be inferred, genealogical tree groups are called families.
