BIOL 103 Chapter Notes - Chapter 26.1-26.3 & 27.1-27.2: Archaea, Genetic Drift, Mudstone
25 Aug 2016
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Week 9 chapter 26. 1-26. 3 & 27. 1-27. 2 speciation and phylogenies and the. Differentiate the three species concepts used in biology and discuss their advantages and disadvantages. Explain how species can emerge through allopatric speciation. Explain how species can emerge through sympatric speciation. Describe how phylogenetic trees are constructed and how you interpret them. Discuss the importance of homology and homoplasy in phylogenetic studies. Examine how the fossil record contributes to our understanding of evolution and describe its limitations. If gene flow ends allele frequencies in isolated populations are free to diverge populations start to evolve independently. Mutation, selection and genetic drift cause isolated populations to diverge which causes distinct species to form causes speciation. Speciation: splitting event that creates 2 or more distinct species from a single group of ancestors. Speciation results from genetic isolation & genetic divergence. Genetic isolation results from lack of gene flow. Genetic divergence occurs because selection, genetic drift and mutation proceed independently in the isolated population.
