Decay of linkage disequilibria (LD) on chromosome 23.

<p>(A) The decay of pairwise linkage disequilibria (r²) among each pair of SNPs is shown against the corresponding physical distances. The three Alpine ibex populations Albris, Cape au Moine and Rheinwald showed high <i>Caib-DRB</i>*2 frequencies and a slow decay in LD over distance. <i>Caib-DRB</i>*2 was rare in the Weisshorn population and the LD decay is steeper. Rho (ρ) values provide estimates of the LD decay with higher values indicating steeper decays and shorter LD blocks. For details on <i>Caib-DRB</i>*2 allele frequencies see <a href="http://www.plosgenetics.org/article/info:doi/10.1371/journal.pgen.1004438#pgen.1004438.s012" target="_blank">Table S5</a>. (B) LD decay in six domestic goat breeds. The LD decay is much steeper in domestic goats than in Alpine ibex populations.