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Lec03.HW - Population Genetics The Foundation Remember...

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1 Population Genetics: The Foundation Remember: individuals don’t evolve, populations do Need a means of taking genetics for individuals (Mendelian mas o menos) to that of populations First step is to create the simplest possible null model for how the population frequencies of alleles at a single (autosomal) locus change (or don’t) from one generation to the next But first some terminology Population – a set of interbreeding organisms (so this really only applies to sexual organisms) Gene – We sometimes use this to mean the same thing as a locus or an allele, so in a pop gen context, it can be confusing. We’ll stick with: Locus – a location on a chromosome, usually of a polypeptide coding gene, but it could be a non-coding gene (e.g., rRNA gene) or even non-coding DNA But first some terminology Allele – the type of gene on a chromosome at a locus For a diploid organism up to two alleles at a locus For a population of diploid organisms alleles up to 2 times the number of individuals Genotype
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