Basic concepts of population genetics - Bioversity International

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With bottleneck and founder effects … Heterozygosity declines at the rate of: H 1 = (1 – 1/2N)H 0 Alleles are lost at the rate of: P = p 2N + q 2N Copyright: IPGRI and Cornell University, 2003 Population genetics 42 Heterozygosity decline Where, Then: Allele loss Where, Then: H 1 = final heterozygosity H 0 = initial heterozygosity N = population size If N = 100 and H 0 = 0.25, then H 1 = 0.24875 If N = 40 and H 0 = 0.25, then H 1 = 0.24685 P = allele loss p and q = allele frequencies 2N = total number of alleles in the population If N = 100, p = 0.90 and q = 0.1, then P = 7.05508 x 10 -10 If N = 15, p = 0.90 and q = 0.1, then P = 0.0423911 If N = 10, p = 0.90 and q = 0.1, then P = 0.12157665 42
Appendix 1 Copyright: IPGRI and Cornell University, 2003 Population genetics 43 Appendix 1. Critical values of the chi-square distribution 43
Page 1 and 2: Genetic diversity analysis with mol
Page 3 and 4: Definitions: Population genetics T
Page 5 and 6: Phenotypic variation Pink Pale crea
Page 7 and 8: Genotype is … The description of
Page 9 and 10: What is polymorphism? ‘Presence
Page 11 and 12: Population structure Three levels o
Page 13 and 14: Allele frequency Allele frequency
Page 15 and 16: Genotype frequency This is the fre
Page 17 and 18: Demonstrating the H-W principle Gen
Page 19 and 20: The chi-square test This hypothesi
Page 21 and 22: Calculating allele frequencies: Exa
Page 23 and 24: Locus A B D … with a codominant m
Page 25 and 26: Locus A Locus B Locus D … with a
Page 27 and 28: ... with a codominant gene having m
Page 29 and 30: Random mating Mating that takes pl
Page 31 and 32: Inbreeding coefficient It compares
Page 33 and 34: Forces shaping genetic diversity M
Page 35 and 36: Migration It is the movement of in
Page 37 and 38: Selection It is the inherited abili
Page 39 and 40: Effective population size Ne is th
Page 41: Consequences … (continued) A bot
Page 45 and 46: By now you should know … The bas
Page 47:
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