Linkage disequilibrium (LD) across the genome as a function of genomic distance between markers is represented here for Spanish Churra sheep.A) Average LD, measured using two parameters, D’ and r2. SNP pairs were stacked according to their physical distance into 14 categories: < 10 kb, 10–20 kb, 20–40 kb, 40–60 kb, 60–100 kb, 200–500 kb, 0.5-1 Mb, 1–2 Mb, 2–5 Mb, 5–10 Mb, 10–20 Mb, 20–50 Mb or > 50 Mb; each point in the graph corresponds to one of these bins. B) Average LD (r2) binning SNPs into 1 Mb-interval categories; half-length LD (r2 = 0.033) approximate distance 2.5 Mb.
García-Gámez et al. BMC Genetics 2012 13:43 doi:10.1186/1471-2156-13-43