Table 4 Relationship between the number of admixture blocks, time of admixture, and wavelet scale
Wavelet scale (no. of SNPs)
Admixture blocksTime of admixture (generations)13,00026,000104,000
8,192–16,384163,8401
4,096–8,19281,92012
2,048–4,09640,960123
1,024–2,04820,480234
512–1,02410,240345
256–5125,120456
128–2562,560567
64–1281,280678
32–64640789
16–323208910
8–1616091011
4–880101112
2–440111213
1–220121314
0–110131415
  • The dominant admixture block size decreases with time since admixture, while conversely, the number of admixture blocks increases. Underlined numbers are from the example presented in the Results section (13,000 SNPs from a genomic region ∼100 Mb in length, comparable to the data set for chromosome 15). Columns to the right show how mapping to wavelet scale depends heavily on SNP density: increasing the number of SNPs two- and fourfold allows higher frequency information to be detected, which in turn informs about shorter (more ancient) admixture tracts.