BIO 370 Lecture Notes - Lecture 7: Genotype Frequency, Gene Flow, Allele Frequency
Document Summary
2/17 - lecture 7 - natural selection and gene flow (chpt. Specifies, under a set of assumptions, what will happen over time to frequencies of genotypes and alleles. What happens to genes in a population when there is no evolution (equilibrium) - frequencies stay the same from population to the next. Only have meiosis and recombination occurring (individual) Know allele frequencies (p"s & q"s) predict the genotype frequencies (aa, aa, aa) Deduce allele frequencies form genotype frequencies p = freq. (aa) + (0. 5 x freq. (aa)) q = freq. (aa) + (0. 5 x freq. (aa)) Population - impose selection - some relationship between genotype and whether you live or die fitness function (set one of the genotypes to the fitness of 1) What is the decrement of fitness for each contribution of an alternative allele (b) 1 p = 0. 36 + (0. 5 x 0. 48) = 0. 6 q = 0. 16 + (0. 5 x 0. 48) = 0. 4.
