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lec40 - Lecture 40/41 Population genetics I Population...

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Picture 164 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
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Picture 166 III. Behavior of alleles in population A. Hardy-Weinberg principle 1. applies to random mating, equivalent to random union of gametes
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