shaw lectures - Population genetics • genetic str uctur e...

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Unformatted text preview: Population genetics • genetic str uctur e of a population • genetic str uctur e of a population group of individuals of the same species that can interbreed Population genetics Population genetics • genetic str uctur e of a population group of individuals of the same species that can interbreed • alleles • genotypes Patterns of genetic variation in populations Changes in genetic structure through time Descr ibing genetic str uctur e • genotype fr equencies • allele fr equencies rr = white Rr = pink RR = red 200 white 500 pink 300 red • genotype fr equencies • allele fr equencies 200/1000 = 0.2 rr 500/1000 = 0.5 Rr 300/1000 = 0.3 RR total = 1000 flowers genotype frequencies: Descr ibing genetic str uctur e 200 rr 500 Rr 300 RR • genotype fr equencies • allele fr equencies 900/2000 = 0.45 r 1100/2000 = 0.55 R total = 2000 alleles allele frequencies: = 400 r = 500 r = 500 R = 600 R Descr ibing genetic str uctur e for a population with genotypes: 100 GG 160 Gg 140 gg Genotype frequencies Phenotype frequencies Allele frequencies calculate: for a population with genotypes: 100 GG 160 Gg 140 gg Genotype frequencies Phenotype frequencies Allele frequencies 100/400 = 0.25 GG 160/400 = 0.40 Gg 140/400 = 0.35 gg 260/400 = 0.65 green 140/400 = 0.35 brown 360/800 = 0.45 G 440/800 = 0.55 g 0.65 260 calculate: another way to calculate allele fr equencies: 100 GG...
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shaw lectures - Population genetics • genetic str uctur e...

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