LD decays as a function of genetic distance in the association panel consisting of 503 upland cotton cultivars. (a): LD decays within distance in the form of r2 based on linkage disequilibrium loci on the same chromosome; (b): LD decays with distance in the form of r2 based on different intervals of linkage disequilibrium loci on the same chromosome; (c): LD decays with distance in the form of Dâ based on linkage disequilibrium loci on the same chromosome. (TIF 2615Â kb)