webnotes_gen_var__101607_ppt

webnotes_gen_var__101607_ppt - Announcements ANGEL point...

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Announcements ANGEL point structure Today: Speciation: How does genetic variation in a population interact with the environment?
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Practice problem: At a particular locus in a population of water fleas ( Daphnia ), you found two alleles ( S and S- ) with a frequency of 0.52 and 0.48, respectively. The number of individuals with each genotype was 42 SS , 48 SS- , and 38 S-S- . Determine if the population is close to Hardy-Weinberg equilibrium or not. If you know how, calculate the Χ 2 statistic to compare the observed and predicted numbers based on allele frequencies using the Hardy-Weinberg principle.
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Mutation Impacts on allele frequencies: Enhanced function vs. loss of function vs. no change in function vs. neutral mutations
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Events or processes affecting genetic variation
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Events or processes affecting genetic variation Bond and Kamil (1998, 1999, 2002) Frequency-dependent selection: fitness of a genotype depends on its frequency in a population; leads to maintenance of rare alleles in populations
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Stabilizing selection = high mortality OR lower fitness time
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Directional selection = high mortality OR lower fitness time barrier
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webnotes_gen_var__101607_ppt - Announcements ANGEL point...

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