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AN102 2-7-14.docx

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Department
Anthropology
Course
CAS AN 102
Professor
Kevin Langergraber
Semester
Spring

Description
AN102 2­7­14 How are new species created? How do they change over time? Biological species concept­ Groups of potentially or actually interbreeding organisms that  are reproductively isolated from others • Environment would call for homozygous on either side, but gene flow makes the  intermediate the most common • Reproductive isolation prevents gene flow o Creates evolution of two different species with two different beak depths,  one small one large Ecological Species concept­ gene flow is neither necessary nor sufficient to maintain  species boundaries • Groups or organism created and maintain through the process of natural selection • Natural selection maintains species boundaries despite presence of gene flow Geographic isolation­ two of more populations of a single species are separated and leads  them to diverge and form new species Allopatric Speciation • River in between two species • No gene flow • Single variable from a population across a geographic barrier • These colonizers will then breed and represent the not popular genotype from the  original population (genetic drift: founder effect) • Drift and mutation will produce random diffe
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