3.10.06 L62 - March 10, 2006 Lecture 62: Population...

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March 10, 2006 Lecture 62: Population Genetics Balanced Polymorphisms Traits found in populations, not in just certain individuals. Relative balance/ about equal frequencies. Gene Pool All the individuals found in a population Usually lotsa genetic diversity.  All the genes in a population. Example: 500 total flowers 320 RR red, 160 Rr red, 20rr white Phenotype Frequency o Red: (320 + 160)/500 = 0.96 o White: 20/500 = 0.04 Genotype Frequency o RR = 320/500 = 0.64 o Rr = 160/500 = 0.32 o rr = 20/500 = 0.04 Allele Frequency o 2 (500) = 1000 alleles total – you must multiply by two because these are diploid. o R = (320 + 320 + 160)/1000 = 0.8 o r = (20 + 20 + 160)/1000 = 0.2 Hardy-Weinberg p + q = 1 (where p=r and q=R)    p 2     +  2pq  + p 2    = 1 f(RR) + f(Rr) + f(rr) = 1 You can use this equation to calculate what is expected for the next generation. Also to estimate quantitratively micro-evolutionary changes.
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3.10.06 L62 - March 10, 2006 Lecture 62: Population...

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