Figure 2. Male and female coverage characteristics of guppy sex chromosome.

(a) Moving average of coverage differences between male and female reads based on sliding window analysis (window size of 40 scaffolds). Ninety-five per cent confidence intervals based on bootstrapping autosomal estimates are in grey. (b) Male (blue) and female (red) coverage for the X chromosome. For both panels, dark purple indicates the region of the sex chromosomes with the greatest X-Y sequence divergence, where coverage is significantly less in males (Stratum I, 22–25 Mb).