2-05-09 - 2/5/09 Forcesof evolution mutation Geneflow...

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2/5/09 Gene flow - exchange of alleles between populations Result of gene flow:  a. introduction of new alleles into a population b. change in frequency of existing alleles M N Pop 1 4 6 Pop 2 8 2 Pop 3 6 4 Gene flow can be characterized by: a. contact between neighboring populations b. large scale migration Gene flow inhibits speciation. Species - Groups or (actually or potentially) interbreeding  organisms that are  reproductively isolated  from other such groups. Theory for the origin of a species: Forces of   evolution Allelic variability Within   population Allelic variability  Between populations mutation increase Increase (pops become dissimilar from  one another) Gene flow increase Decrease (pops become similar to one  another) Genetic drift decrease Increase (pops become dissimilar from  one another) Natural  selection decrease Increase 
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Consider a species to consist of 4 populations (A, B, C, D). Populations have 
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This note was uploaded on 12/09/2009 for the course ANTH 1001 taught by Professor Tague during the Spring '07 term at LSU.

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2-05-09 - 2/5/09 Forcesof evolution mutation Geneflow...

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