Lecture 12 Notes

Lecture 12 Notes - 18:43 Lecture 12, February 8th 2012...

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18:43 Lecture 12, February 8 th 2012 Lecture Outline – Genetic Drift Changes in allele frequencies of alleles in a population due to chance Effect of population size alone on allele/genotype frequencies Random chance will lead to fluctuations Effects of genetic drift Proves that Evolution can occur without natural or sexual selection Loss of variation within populations Increase variation between populations Populations Size Larger population, larger time Smaller population loses heterogeneity Evolution by genetic drift is faster in small populations than in large Starting Frequency Closer it is to 1, more likely to fixate (go to 1). Less than .5, more likely to go to 0.
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Evolution Fall 2012 Probability, currently, that allele will go to frequency is equal to frequency of allele right now (p=0.1, 10% chance of going to fixation) Heterozygosity Goes down when p decreases Drift causes a decrease in heterozygosity Smaller population, faster decrease p p^2 2pq q^2 H 0.5 .25 .5 .25 .5 0.2 .04 .32 .64 .32 0.1 .01 .18 .81 .18 0 0 0 1 0
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This note was uploaded on 04/09/2012 for the course CHEM 251 taught by Professor Schauer during the Spring '08 term at UNC.

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Lecture 12 Notes - 18:43 Lecture 12, February 8th 2012...

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