Figure 5. Comparison of gene mosaicism in 163 Lambda-like phages encoding (Rec⁺) or lacking (Rec⁻) recombinases.

Mosaic genes are pairs of homologous genes with low evolutionary distances (low d) in phages with high evolutionary distances (high D). For each threshold T_d and T_D, we compared the frequency of mosaic genes of Rec⁺ phages (M_Rec ⁺) and Rec⁻ phages (M_Rec ⁻). The color scale gives the ratio of the frequency of mosaic genes between phages encoding and lacking recombination functions (M_Rec ⁺/M_Rec ⁻). Non-significant (p>0.05, Wilcoxon test) differences on the frequency of mosaic genes are indicated on the graph (ns).