Figure 5: A schematic of the male neo-X chromosome
(A) Schematic of the neo-sex chromosomes. The neo-X chromosome originates from the fusion of an ancestral autosome and the ancestral-X chromosome (shown in orange). The neo-Y chromosome (shown in cyan) originates from the other copy of the ancestral autosome found in the neo-X. (B) Schematic of the male neo-X chromosome. Regions of cyan indicate neo-Y scaffolds identified from the draft male assembly by Dowle et al. (2017) that mapped on to the male neo-X chromosome in the new genome assembly. The inset image at the top of the figure illustrates that these scaffolds are short and not contiguous along the chromosome, but rather interspersed among neo-X regions. The grey region on the far-right portion of the chromosome indicates a large region where putative neo-Y scaffolds failed to map, and likely represents the ancestral-X portion of the chromosome.