The influence of missing data and auxiliary tag SNPs. (A) A haplotype block defined by 12 SNPs and 4 haplotype patterns. Each column represents a haplotype pattern and each row represents a SNP locus. The black and grey boxes stand for the major and minor alleles at each SNP locus, respectively. (B) Tag SNPs genotyped without missing data. (C) Tag SNPs genotyped with missing data. (D) The auxiliary tag SNP S5 for h2. (E) The auxiliary tag SNP S8 for h3.