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Presentation15 - Population Genetics AGRY 320 Shubha...

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Population Genetics Shubha Subramanyam Department of Agronomy Purdue University AGRY 320
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Population Genetics Gene: Specific region of DNA controlling a specific trait Alleles: Different versions of a gene Study of genetic make-up of a population and changes in make-up under the influence of evolutionary process Alleles Phenotypes Genotypes C R Red C R C R C W Pink C R C W White C W C W
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Population Genetics Population: Group of interbreeding organisms within an area Gene Pool: Sum total of genes in a gamete of a population Gene Frequency: Proportion of different alleles of a (Allele Frequency) gene in a population Genotype Frequency: Proportion of genotypes in a population
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Population Genetics Calculation of Allele Frequency in a Gene Pool Allele Frequency = Frequency of Homozygotes + (1/2)(Frequency of Heterozygote) Genotype Genotype Count MM MN NN 50 20 30 Genotype Frequency 50/100 = 0.5 20/100 = 0.2 30/100 = 0.3 1 Human MN Blood Groups 3 genotypes: MM , MN , and NN in 100 individuals (total 200 alleles) Allele Frequency ƒ M = p = (100 + 20)/200 = 120/200 = 0.6 ƒ N = q = (60 + 20)/200 = 80/200 = 0.4 1
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Calculation of Allele Frequency in a Gene Pool From Genotype Frequency Frequency of Homozygotes + (1/2)(Frequency of Heterozygote) Genotype Genotype Count MM MN NN 50 20 30 Genotype Frequency 50/100 = 0.5 20/100 = 0.2 30/100 = 0.3 1 Allele Frequency ƒ M = p = 0.5MM + (1/2) (0.2MN) = 0.6 ƒ N = q = 0.3NN + (1/2)
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This note was uploaded on 02/26/2012 for the course AGRY 320 taught by Professor Stewert during the Spring '09 term at Purdue.

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Presentation15 - Population Genetics AGRY 320 Shubha...

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