moritz4-1 - Bio1B Evolution 4 Last lecture: More history -...

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1 Bio1B Evolution 4 Last lecture: More history - Darwin+Mendel => the neodarwinian synthesis Mechanisms of evolution: – Evolution in populations - population genetics – Allele, genotype and phenotype frequencies – Predicting genotype freq’s: Hardy (Castle) Weinberg Equilibrium Application: Null model for evolution Predicting heterozygote frequencies for recessive traits Today Evolutionary processes Sampling effects => “genetic drift” – Relevance in evolution - loss of variation, bottlenecks Mutation as the ultimate source of variation; effects on fitness Migration (gene flow) - spreading mutations, clines Selection – fitness – Forms and consequences
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2 Hardy-Weinberg genotype frequencies as a function of allele frequencies at a locus with two alleles Futuyma, 2nd Ed.
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3 Effect of small population size - “genetic drift” • Sampling gametes => zygotes • Small population have greater sampling error => larger fluctuations in allele frequency => reduced variation within populations Fig. 23.8
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This note was uploaded on 04/16/2011 for the course BIOLOGY 1B taught by Professor Carlson during the Spring '02 term at University of California, Berkeley.

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moritz4-1 - Bio1B Evolution 4 Last lecture: More history -...

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