Evolution - • Allopatric speciation – Geographic...

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Click to edit Master subtitle style Overview of Evolution Unit
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Major Issues (Chapters) Historical perspective (chapter 17) Microevolution (chapter 17) Speciation (chapter 18) Macroevolution (chapter 19) Origin of life (Chapter 20)
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Historical perspective Pre-Darwinian ideas Profile of Charles Darwin Darwin and Wallace’s model for Natural Selection (Descent with Modifications) Overproduction of all species Variation in all species Some of that variation affects survivorship
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Microevolution Concept of gene pool and allele frequencies Hardy Weinburg equilibrium defines non- evolution Forces of change in populations mutations migration selection (Natural and Sexual) non-random mating random events & sampling error
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Speciation Problems with definitions morphological, biological, evolutionary Models of how species arise
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Unformatted text preview: • Allopatric speciation – Geographic barrier to gene flow – Divergence in isolation – Isolating mechanisms • Sympatric speciation - special requirements – hybridization – sexual selection and non-random mating – Temporal segregation • Long term outcome Speciation (continued) • Rate of speciation important • Problem is really how few species we have instead of how many • Deep time makes most things possible Macroevolution • Earth is about 4.5 billion years old • Life has been here over 3.8 billion years • Fossils represent earlier forms of life – recent fossils more similar to modern species – more ancient fossils more different – many different extinct forms • Lots of evidence for these points – stratigraphy – radiometric dating – continental drift...
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Evolution - • Allopatric speciation – Geographic...

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