Lecture31outline speciation2

Lecture31outline speciation2 - Evolutionary Biology (BIOL...

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Evolutionary Biology (BIOL 2704) Dr. Lisa Belden Spring 2010 Lecture #31 Outline 14 April 2010 MAIN TOPICS: Speciation, part 2 Species concepts Genetic isolation Trait divergence Reproductive isolation I clicker which is most widely used? B.biological species concept bb? Sympatric speciation from… Development of polyploidy/hybridization Disruptive natural selection Nonrandom mating (assertive mating/sexual selection) Iclicker: polyploidy is most common in: A. plants development of polyploidy/ hybridization ***Mainly seen in ___ plants _______*** _____ Polyploidy ____ is…. the only known mode of _ instantaneous _speciation by a single genetic event. the only mode of sympatric speciation that is _ widely accepted as common ____ Among ~300,000 species of land plants, 2-4% derived from polyploidization ____ Hybridization ______… if get viable and fertile ____ hybrids ____ can get zones of __ hybridization ___ where the genotype/phenotype varies from both parental species. if this occurs in unique habitat, can get __ hybrids ___ that are better adapted than either parent, and result in new species. Iclicker: Disruptive selection is: B. rare in nature Lecture 31, page 1
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Evolutionary Biology (BIOL 2704) Dr. Lisa Belden Spring 2010 disruptive natural selection The theory: get selection for extremes in phenotype, this leads to assertive mating, which further isolates the extremes. Eventually, get new species.
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Lecture31outline speciation2 - Evolutionary Biology (BIOL...

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