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6 - Natural Science Lecture Next team exam is three weeks...

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Natural Science Lecture  06/11/2007 12:56:00 Next team exam is three weeks from today. Biological Species concept: species form through reproductive isolation. How to define reproductive isolation? Barriers to mating Premating Postmating How does it happen? Allopatric speciation Sympatric speciation Rates of Speciation The biological species concept Individuals are of the same species IF they have the potential to interbreed  and produce viable (capable of surviving), fertile offspring. This concept is meaningless in the cases of: o Fossils   o asexually reproducing organisms The important thing in defining a species is reproductive isolation. Lets consider two individuals---pre mating barriers preventing organisms from  having fertile offspring. What if they don’t live in the same area? HABITAT ISOLATION
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6 - Natural Science Lecture Next team exam is three weeks...

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