Figure 7.

Determining the ancestry of the PWK/PhJ Y-linked duplication. (A) Principal components analysis (PCA) on genotype matrix at $65,977$ autosomal SNPs from the 77K array platform, in a collection of 346 wild mice of M. m. domesticus (dom) M. m. musculus (mus), M. m. castaneus (cas), and M. spretus ancestry, plus the three wild-derived inbred strains used in this study (open points with labels). Data from Didion et al. (2016). (B) PCA on 84 sites informative between the PWK/PhJ X and Y chromosomes in wild mice (colored by subspecies) and (WSB/EiJ $\times$ PWK/PhJ)N2 progeny.