Chapter 20 - Speciation Understand the mechanisms that...

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Unformatted text preview: Speciation Understand the mechanisms that govern reproductive isolation that interrupts gene flow between species. Be able to describe the affect that this has on long-term change of the affected species. Be able to explain allopatric and sympatric species. Understand the role that extinction plays in the evolution of species. Be able to describe the difference between background extinction and mass extinction. What is a species? Last lecture Group of organisms with similar structure, function, and behavior that are capable of interbreeding with one another Definition based on morphological species concept Structure alone is not adequate to explain what is a species Biological Species Concept Biological species concept Species consists of one or more populations whose members interbreed in nature to produce fertile offspring and do not interbreed with member of other species New species evolve when formerly interbreeding populations become reproductively isolated Ernst Mayr 1942 What is a species?What is a species?...
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Chapter 20 - Speciation Understand the mechanisms that...

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