Lect_6_MutationVariation

Method 2 using genotype counts ss sf ff

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Unformatted text preview: nge through 6me in popula6ons. It is built around the Hardy- Weinberg (W- H) equilibrium principle: the H- W principle shows the simple rela6onship that exists between allele frequencies and genotype frequencies in a locus in an equilibrium randomly ma6ng popula6on free of evolu6onary forces The H- W equilibrium is the NULL model of evolu.on, it specifies what to expect if evolu6on wasn’t happening The easiest way to ‘get’ how H- W works is to think like a gamete. You need to keep track of alleles and what alleles are paired ader gametes combine to form zygotes (which are called ‘genotypes’). Life cycle… Example: measuring allele and genotype frequencies SF SS FF 1 2 3 4 5 10 11 12 13 14 6 7 8 S F S F 15 16 17 9 What is the frequency of the S and F alleles? Method 1: Coun6ng alleles (in this case there are two possible alleles at one locus. That means SS, SF, FF genotypes are possible.) Total number of alleles tested: 34 (17 individuals x 2 possible alleles) Example: measuring allele and genotype frequencies SF SS FF 1 2 3 4 5 10...
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This note was uploaded on 02/10/2014 for the course ECOL 335 taught by Professor Reinthal during the Spring '10 term at University of Arizona- Tucson.

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