6-Genetic Drift

6-Genetic Drift - Founder effect exercise After a...

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Evolutionary forces: Mutation Migration   Genetic Drift in small populations Non-random mating Selection genetic variation
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Evolutionary forces: Mutation Migration  Genetic Drift in small populations Non-random mating Selection genetic variation
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Genetic Drift Genetic Drift = sampling error in the  production of offspring.
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Founder effect Founder effect – when a new population is  founded by a few individuals, allele  frequencies are likely to differ from the  source population solely by chance.
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Founder effect: A new population of Darwin’s finches was founded on Daphne Major in  1982. Source population 5 Founders Newly established population Descended from 5 founders from the results of Grant and Grant. 1995. Evolution. 49:229-240.
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Unformatted text preview: Founder effect exercise After a bottleneck the # alleles/loci ( A ) and heterozygosity ( H ) are reduced. What would happen over the long term, if population size remained small? • Evodots How small is small? • Evolution by genetic drift is faster in small populations than in large. Experimental populations of Drosophila. N = 16. Buri 1956. Genetic drift will eventually lead to the fixation of one allele. Either p 1 or q 1. Genetic drift leads to divergence between populations. What happens to heterozygosity? Take home messages: • Drift change in allele frequency due to random sampling decreased heterozygosity p=1 or q=1...
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This note was uploaded on 02/24/2011 for the course BIOL 201 taught by Professor Mitchell during the Spring '07 term at UNC.

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6-Genetic Drift - Founder effect exercise After a...

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