Figure 4 demonstrates the impressive
gain of the discriminative power with increasing numbers
of Y-STRs. The determination of the match probability
between Y-STR or mtDNA profiles via the
mostly applied counting method [30] requires large,
representative, and quality-assessed databases of haplotypes
sampled in appropriate reference populations,
because the multiplication of individual allele frequencies
is not valid as for independently inherited autosomal
STRs [31].