BIO 24b-%20Allopatry

BIO 24b-%20Allopatry - Outline 24b-Allopatry December 1...

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1 11/14/2008 1 24b-Allopatry December 1 Continued (draft as of Nov 14) 11/14/2008 2 Outline Allopatry by •D ispe rsa l •V ica r iance 11/14/2008 3 Great online info http://evolution.berkeley.ed u/evosite/evo101/VSpeciat ion.shtml 11/14/2008 4 How does speciation happen? Allopatric speciation— 1. geographic isolation followed by 2. increased diversity may lead to 3. reproductive isolation
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2 11/14/2008 5 Types of reproductive isolation { Prezygotic isolation individuals from different populations are unable to mate (gametes don’t meet)-but more than just physically/geographically separated { Postzygotic isolation individuals from different populations can breed, but the offspring produced have low or no fitness ( Table 26.1 ). 11/14/2008 6 Prezygotic reproductive isolation { Breed at different times { Breed in different habitats { Courtship is different { { Female & male genitalia are incompatible 11/14/2008
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BIO 24b-%20Allopatry - Outline 24b-Allopatry December 1...

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