Fig. 3.

PHYB linkage disequilibrium. Pairwise linkage disequilibrium (r²) between single nucleotide polymorphisms in the A. thaliana PHYB gene. Polymorphic sites are arranged along the diagonal from lower left (5′) to upper right (3′). Numbered polymorphisms highlighted by darker lines correspond to the numbered amino acid polymorphisms in Fig. 1. To read the LD between any two sites, trace a column upwards from the 5′ site and a row leftward from the 3′ site; the square in which the column and row intersect indicates the LD.