BIOLOGY 1M03 Chapter Notes - Chapter 27: Even-Toed Ungulate, Chapter 27, Tiktaalik
13 May 2015
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Pages 521-525 ; tutorial 3 ; lecture 13. Last time: finished ch 26 ; sympatric speciation (maggot flies) ; polyploid speciation (auto- and allo-, plants and animals, vizcacha rats) ; hybridization and secondary contact (reinforcement, hybrid zones, new species) Phylogenies + fossils are used to infer the timing of divergences: adaptive radiations are a major pattern in the history of life. They are instances of rapid diversification associated with new ecological opportunities and morphological innovations: mass extinction are part of life, they eliminate most species alive at their occurrence. 27. 1 tools for studying history: phylogenetic trees: the evolutionary history of a group of organisms is called its phylogeny and usually represented in the form of a phylogenetic tree where we can see ancestor- descendant relationships among populations/species. It is based on the overall similarity (% distance) among taxa. If it is dna, then it is percent difference.
