Fig 4. Distribution of SNPs distinguishing between potential parents.

(A) Colored bars in concentric rings represent every site for which a particular SNP is unique to either of the two sets of putative parents and fixed homozygous in those parents. Colors indicate whether the variant is present as homozygous for either parental type or heterozygous with one of each allele. A small number of sites had genotypes not fixed in either parent group or no reliable genotype call. There are very few SNPs in the red or grey categories. (B) Shows a magnified view of the same data for four regions, chosen to highlight variation between different isolates.