New PDF release: Critical Phenomena

By L. Garrido, J. Brey, R.B. Jones

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Cavalli-Sforza, L. L. (1991) Nature (London) 368, 455–457. Bowcock, A. , Kidd, J. , Mountain, J. , Kidd, K. K. & Cavalli-Sforza, L. L. (1991) Proc. Natl. Acad. Sci. USA 88, 839–843. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. , Meyer, D. & Cavalli-Sforza, L. L. , Singapore), pp. 123–148. Cann, R. , Stoneking, M. & Wilson, A. C. (1987) Nature (London) 325, 31–36. Templeton, A. R. (1993) Am. Anthropol. 95, 51–72. , Tsugane, K. & Takahata, N. (1995) Proc.

Our working hypothesis is that a rare variant (perhaps a new mutation) has recently and rapidly increased in frequency to around 50%. As it increased in frequency, the haplotype in which it was embedded was pulled up in frequency at the same time. Although selection on the Fast͞Slow site might have driven the Slow allele to its present frequency, such selection by itself cannot account for the observed high frequency of the Fast A haplotype. Thus, selection on some other site would appear to be involved.

7725 7726 Colloquium Paper: Hudson et al. Proc. Natl. Acad. Sci. USA 94 (1997) FIG. 1. Observed and predicted levels of divergence between Fast (F) and Slow (S) alleles in a sliding window across the Adh region of D. melanogaster. ) The site coding for the F͞S difference is at position 1500. Note the large peak of variation centered on the F͞S site. For details see Kreitman and Hudson (4). Hudson et al. (13) revealed no significant departures from equilibrium neutral models. There were, however, several surprising and interesting aspects of the sequence variation that suggested the recent action of natural selection.

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