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Unformatted text preview: Pictu re 1 6 4 Lecture 40/41 – Population genetics I. Population genetics- population – group of organisms of same species living in area within which likely to find mates- subpopulation – distinct breeding group within limited area- gene pool – complete set of genetic info within individuals in a population II. allele frequency A. eg. M, N blood group- codominant- 2 alleles of single gene- 3 possible genotypes: MM, MN and NN- British study of 1000 individuals phenotypes genotypes 298 M 298 MM 489 MN 489 MN 213 N 213 NN B. usually consider frequencies of genotypes- genotype frequency = # with given genotype/total- allele frequency = # of copies of allele 1 (or 2 …)/total- frequencies must add to 1 when all possibilities have been considered- if allele frequency = 1.0, allele is fixed- if allele frequency = 0, allele is lost 1 Pictu re 1 6 III. Behavior of alleles in population A. Hardy-Weinberg principle 1. applies to random mating, equivalent to random union of gametes1....
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This note was uploaded on 07/01/2011 for the course L 311 taught by Professor Forrester during the Fall '10 term at Indiana State University .
- Fall '10