Figure 3. Evolutionary strata and sequence conservation between the pygmy rattlesnake and garter snake W-candidate scaffolds mapped along the Z chromosome.

The middle three tracks show the position of candidate W sequences along the Z chromosome in garter snake (top) and pygmy rattlesnake (bottom), and their overlap (center). The top and bottom plots show nucleotide identity between Z-W gametologs (grey dots), and the median (red line) inferred for each of the putative strata for garter snake and pygmy rattlesnake (blue boxes; the y range of the boxes represents the interquantile range of the identity values in each region). The gray shaded region represents identity below 30%, indicating low quality mapping. As in Figure 2, the data in this figure contain both non-coding and coding scaffolds.