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. 2009 Aug 21;4(8):e6711. doi: 10.1371/journal.pone.0006711

Figure 1. IBS patterns for father, mother, and son on chromosome X.

Figure 1

A portion of the SNPduo output for three pairwise comparisons of the X chromosome of father/mother (A), mother/son (B), and father/son (C) genotyped on the Illumina HumanHap 550K platform. In the unrelated parents, there were many instances of no shared alleles (e.g. AA to BB; panel A). In the mother-son comparison, there were no IBS-0 SNPs because the son inherited a copy of the maternal X. In the father/son comparison, each chromosome was hemizygous (either A or B genotypes, interpreted as AA or BB) and in the absence of heterozygous calls no IBS-1 SNPs were expected to occur since the X chromosomes were non-identical (both IBS-2 and IBS-0 SNPs were apparent). Thus, the one call of an IBS-1 SNP (arrow) was likely a genotyping error. The standard SNPduo output includes genotype calls (not shown; see e.g. Fig. 3).