Population+genetics+problems+WI2010

Population+genetics+problems+WI2010 - Problems in...

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Problems in Population Genetics Frequency: the number of times that a value appears in a set. In the set {1,3,3,4,2,5}, the frequency of the value “3” is 2 and the frequency of the value “5” is 1. Relative Frequency : the frequency expressed as a proportion of the total number of values in the set. Thus, in the example above, the frequency of “3” is 2/6 or 0.333… In population genetics, we talk about relative frequency, but shorten the term to “frequency”. Frequency and probability are related. If we know that ¼ of the alleles at a particular gene locus in a population are “ob” (as opposed to wild type, “ob+”), and we randomly select 1 egg from the population, then the probability that the egg will have the “ob” allele is 0.25. If we then replace that egg and sample 100 times, at what frequency would we get an “ob” egg? That frequency would also be around 0.25. Problem 1 .In a population of voles, fur color is determined by a single locus. The population is very large, and immigration, emigration, and selection are negligible. The genotypes AA and Aa have the BROWN fur phenotype. The genotype aa has the WHITE fur phenotype. In the population, 50% of the alleles at this locus are “A” and 50% of the alleles are “a”. a.
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Population+genetics+problems+WI2010 - Problems in...

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