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. 2013 Jun 6;9(6):e1003521. doi: 10.1371/journal.pgen.1003521

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© 2013 Harris and Nielsen

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Each of the colored tract spectra in Figure 2A was generated from base pairs of sequence alignment simulated with Hudson's MS [68]. The IBS tracts are shared between two populations of constant size 10,000 that diverged 2,000 generations ago, with one haplotype sampled from each population. 5% of the genetic material from one population is the product of a recent admixture pulse from the other population. Figure 2B illustrates the history being simulated. When the admixture occurred less than 1,000 generations ago, it noticeably increases the abundance of long IBS tracts. The gray lines in 2A are theoretical tract abundance predictions, and fit the simulated data extremely well. To smooth out noise in the simulated data, abundances are averaged over intervals with exponentially spaced endpoints .

Inline graphic — Each of the colored tract spectra in Figure 2A was generated from base pairs of sequence alignment simulated with Hudson's MS [68]. The IBS tracts are shared between two populations of constant size 10,000 that diverged 2,000 generations ago, with one haplotype sampled from each population. 5% of the genetic material from one population is the product of a recent admixture pulse from the other population. Figure 2B illustrates the history being simulated. When the admixture occurred less than 1,000 generations ago, it noticeably increases the abundance of long IBS tracts. The gray lines in 2A are theoretical tract abundance predictions, and fit the simulated data extremely well. To smooth out noise in the simulated data, abundances are averaged over intervals with exponentially spaced endpoints .