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Detecting recent positive selection in the genome Wolfgang Stephan Abt. Evolutionsbiologie LMU München
Coalescent without recombination and selection Past Present Sampled gene copies T(2) T(3) T(4) T(5)
Two-locus model of genetic hitchhiking Selected locus Neutral locus A a A no recombinationrecombination A A a
Ancestral recombination graph with hitchhiking T = 0 (Present) T = neutral phase selective phase neutral phase T limit
Position (kb) Heterozygosity
Expected hitchhiking effect of a beneficial mutation Position (kb) Heterozygosity
Composite-likelihood ratio test (Kim and Stephan 2002)
Demographic model of D. melanogaster
wapl 6373103113 83 92 codingnon-coding (intergenic) EG:87B1.3Pgdbcn92 wapl Cyp4d1152A3.3 152A3.7/Cyp4d14 Cyp4d2 / Cyp4ae1 / pn / Nmd3 / CG17776 17E2.1 non-coding (Intron (>300 bp)) Positions in kb csw 23 13 Unc-76 03 EG:67A9.2 EG:22E5.4/ 22E5.9 D: (6 lines)
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:. A. B. C. D. A. 92% 90% 60 P S.. ~ ~
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