Oxford grid comparing genomes of Gnathopogon and zebrafish. Each dot represents the position of a homologous locus. The x-axis is proportional to physical length; the y-axis is proportional to Kosambi cM. (A) Genome-wide comparison of the positions of homologous loci. (B) Enlarged cells of the Oxford grid, showing extensive and disrupted collinearity of the syntenic chromosomes of Gnathopogon and zebrafish species.