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exam2evo - Exam 2 Evo Systematic Bio 1 Tree Thinking...

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Exam 2: Evo Systematic Bio 1: Tree Thinking Phylogeny is a “working hypothesis” in that we are always looking for the “true” tree Anagenesis – phyletic change, s the evolution of species involving an entire population rather than a branching event, as in cladogenesis . Cladogenesis - is an evolutionary splitting event in a species in which each branch and its smaller branches forms a " clade ", an evolutionary mechanism and a process of adaptive evolution that leads to the development of a greater variety of sister species . Different types of phyletic groups Method of parsimony – simplest tree is probably the right one Systematic Bio 2: Parsimony and Characters Cladogram – even branches Phylogram – uneven branches, corresponds to amount of evolutionary change parallelism is generally considered to be the production of apparently identical traits by the same generative systems, whereas convergence is generally considered to be the production of similar traits by different generative systems Constructing a gene tree from molecular data o Choose genes of interest – must be synapomorphies and alignable o Identify homologs Selection of homologous sequences EASY with closely related taxa (OTU’s) NOT so easy with distantly related taxa
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