Estimated copy number of each allele at AMY1 gene locus in real data analysis. Estimated copy numbers of four copy unit alleles at AMY1 gene locus for trio samples are presented. The thin lines with labels NA12877 (father) and NA12878 (mother) represent copy numbers of them and the 11 dashed and dotted thin lines are that of their offspring. The thick line represents the sum of copy numbers of the parents. This result is consistent in a sense of heredity pattern in the trio samples, that is, copy number of offspring for each allele is less than or equal to the sum of that of its parents.