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Speciation

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. Do you speak another language? Help me translate my videos: http://www.bozemanscience.com/transla... 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.... "File:Great Wall of China July 2006.JPG." Wikipedia, the Free Encyclopedia. http://en.wikipedia.org/wiki/File:Gre.... File:Hamburger Sandwich.jpg, n.d. http://commons.wikimedia.org/wiki/Fil.... "File:Loxodontacyclotis.jpg." Wikipedia, the Free Encyclopedia.http://en.wikipedia.org/wiki/File:Lox.... "File:Polyploidization.svg." Wikipedia, http://en.wikipedia.org/wiki/File:Pol.... "File:Punctuated-equilibrium.svg." Wikipedia, http://en.wikipedia.org/wiki/File:Pun.... "File:Reef0484.jpg." Wikipedia, http://en.wikipedia.org/wiki/File:Ree.... "File:Salad Platter.jpg." Wikipedia, http://en.wikipedia.org/w/index.php?t.... "File:Speciation Modes.svg." Wikipedia, . http://en.wikipedia.org/wiki/File:Spe.... "File:Stephen Jay Gould by Kathy Chapman.png." Wikipedia, http://en.wikipedia.org/wiki/File:Ste.... "File:Tympanoctomys Barrerae.jpg." http://en.wikipedia.org/wiki/File:Tym.... "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."