2-20-09 - 2/20/09 Lecture 11: Measuring Microevolution...

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2/20/09 Lecture 11: Measuring Microevolution Hardy-Weinberg Law - Phenotype frequencies: yellow and green peas in population, what you see and what is expressed in the genes o Percentages, i.e. .75 Must equal 1.00 or 100% of the individuals in the population - Genotype frequencies: MM 30 individuals 30/130=.23 MN 40 “ 60/130=.31 NN 60 ” 60/130=.46 Total 130 “ 1.00 - Gene Frequencies (allele frequencies) o The proportion of a particular allele at a given locus relative to all other alleles at that locus o Importance of Gene Frequencies To characterize genetic variation in a population To compare gene pools (common origin, migration, isolation) To model evolutionary change (microevolution) - Some pretty basic algebra: the binomial expansion o X+Y=1 o (x+y) 2 =1 2 o (x+y)(x+y)=1 o X 2 +2xy+y 2 =1 - Hardy-Weinberg Law o The genotype frequencies of the offspring generation can be determined from the gene frequencies of the parents
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2-20-09 - 2/20/09 Lecture 11: Measuring Microevolution...

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