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.