BIO 9-SampErrGenDrift08WEB

BIO 9-SampErrGenDrift08WEB - BIO152:geneticdrift Lecture 9...

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BIO152: genetic drift Lecture 9 October 6,2008
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04/26/10   2 Lecture 11 Outline Neutral evolution Pattern Process Genetic drift = sampling error Genetic drift in small populations Bottleneck effect Founder effect
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04/26/10   3 Facilitated Study Groups-week of Oct 6 Critical reading skills Critical reading skills & continued practice with how to understand multiple choice questions
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04/26/10   4 Neutral evolution Frequency of traits (alleles) in a population may change without selection When an allele is not under selection, the frequency will drift (change) randomly IF there is no correlation between trait and reproductive success, then change in the frequency of that trait is due to genetic drift not natural selection .
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04/26/10   5 Contribution of  Predications a) If genetic variety is inconsequential to ►genetic drift is main agent for evolution OR b) If genetic variety leads to phenotypic differences which affect fitness, natural selection is the main driving force.
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04/26/10   6 Genetic drift — one of the basic mechanisms of evolution — is simply the evolutionary equivalent of a sampling error. (Freeman 25.3)
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04/26/10   7 Beads and sampling error
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04/26/10   8 Genetic drift Drift is example of when evolution is due to chance, not selection (selection is NOT due to chance: Remember that selection is due to some characteristic providing an advantage or disadvantage for surviving and having more viable offspring)
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04/26/10   9 "If a population is finite in size (as all
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This note was uploaded on 04/25/2010 for the course BIO BIO152 taught by Professor Cordon during the Fall '09 term at University of Toronto.

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BIO 9-SampErrGenDrift08WEB - BIO152:geneticdrift Lecture 9...

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