χ2 test of independence for the two-way table chromosome × chromosome region, for Apis mellifera (A) and Danio rerio (B). The size of the dot is inversely proportional to the P-value, with scaling such that comparisons of sizes between tables are meaningful. Boxplots of the χ2 statistics for each of two, five and eight probes are indicated on the X-axis. A logarithmic scale is used on the Y-axis for the χ2 values. The red dotted line represents the significance limit for Apis mellifera (C) and Danio rerio (D). The distribution of the cell probabilities from the chromosome × chromosome region two-way table (figure 3) is plotted for Apis mellifera (E) and Danio rerio (F).