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Speciation

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Published on Jun 24, 2011

008 - Reproductive Isolation and Speciation

Paul Andersen explains how reproductive isolation can eventually lead to speciation. Three main barriers to gene flow are included: geographic, pre-zygotic and post-zygotic. Both allopatric and sympatric speciation are discussed. A brief discussing of polyploidy and punctuated equilibrium are also included.

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All of the images are licensed under creative commons and public domain licensing:
Davison, Angus; Chiba, Satoshi; Barton, Nicholas; Clarke, Bryan. "Speciation and Gene Flow Between Snails of Opposite Chirality." PLOS Biology, September 2005.
"File:Drosophila Speciation.svg." Wikipedia, the Free Encyclopedia. http://en.wikipedia.org/wiki/File:Dro....
"File:Eastern American Toad.jpg." Wikipedia, the Free Encyclopedia. http://en.wikipedia.org/wiki/File:Eas....
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"File:Polyploidization.svg." Wikipedia, http://en.wikipedia.org/wiki/File:Pol....
"File:Punctuated-equilibrium.svg." Wikipedia, http://en.wikipedia.org/wiki/File:Pun....
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"File:Salad Platter.jpg." Wikipedia, http://en.wikipedia.org/w/index.php?t....
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"File:Wheat close-up.JPG." http://en.wikipedia.org/wiki/File:Whe....
Jimpaz. Anaxyrus Fowleri, April 25, 2010. Own work. http://commons.wikimedia.org/wiki/Fil....
Lascorz, Juan R. English: Mule in Moriles, Córdoba (Spain)., July 2009. Own work. http://commons.wikimedia.org/wiki/Fil....
Marlin, Bruce. Siberian Elm Ulmus Pumila. Morton Arboretum Accession 325-70-4., July 12, 2007. Own work: http://www.cirrusimage.com/tree_Siber.... http://commons.wikimedia.org/wiki/Fil....
Rae, Alastair. Sturnella Magna, February 25, 2009. originally posted to Flickr as Eastern Meadowlark. http://commons.wikimedia.org/wiki/Fil....
Unknown. English: A Sperm Cell Fertilizing an Egg Cell, [object HTMLTableCellElement]. http://www.pdimages.com/web9.htm. http://commons.wikimedia.org/wiki/Fil....
USA, Kevin Cole from Pacific Coast. Western Meadowlark (Sturnella Neglecta). Taken on Turri Road from the Car with a Canon 500mm f/4L and 40D. Kirk Window Mount and Wimberley Head., March 13, 2008. Western Meadowlark (Sturnella neglecta) The State bird for Kansas, Montana, Nebraska, North Dakota, Oregon and Wyoming. http://commons.wikimedia.org/wiki/Fil....
:Etosha elefant.jpg." http://hi.wikipedia.org/wiki/%E0%A4%9....
"File:Wheat close-up.JPG." Wikipedia, the Free Encyclopedia. Accessed November 9, 2013. http://en.wikipedia.org/wiki/File:Whe....
Jimpaz. Anaxyrus Fowleri, April 25, 2010. Own work. http://commons.wikimedia.org/wiki/Fil....
Lascorz, Juan R. English: Mule in Moriles, Córdoba (Spain)., July 2009. Own work. http://commons.wikimedia.org/wiki/Fil....
Marlin, Bruce. Siberian Elm Ulmus Pumila. Morton Arboretum Accession 325-70-4., July 12, 2007. Own work: http://www.cirrusimage.com/tree_Siber.... http://commons.wikimedia.org/wiki/Fil....
Rae, Alastair. Sturnella Magna, February 25, 2009. originally posted to Flickr as Eastern Meadowlark. http://commons.wikimedia.org/wiki/Fil....
Unknown. English: A Sperm Cell Fertilizing an Egg Cell, [object HTMLTableCellElement]. http://www.pdimages.com/web9.htm. http://commons.wikimedia.org/wiki/Fil....
USA, Kevin Cole from Pacific Coast. Western Meadowlark (Sturnella Neglecta). Taken on Turri Road from the Car with a Canon 500mm f/4L and 40D. Kirk Window Mount and Wimberley Head., March 13, 2008. Western Meadowlark (Sturnella neglecta) The State bird for Kansas, Montana, Nebraska, North Dakota, Oregon and Wyoming. http://commons.wikimedia.org/wiki/Fil....
"चित्र:Etosha elefant.jpg."

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