Y-STR
| STR site | Mutation rate (x 10−3) | |||||
| LB-96%CI | 'rate' | UB-96%CI | Notes | |||
| DYS19 | 1.5 | 2.4 | 3.5 | 23 of 9658 | ||
| DYS385 | 1.4 | 2.1 | 3.0 | 31 of 14896 | ||
| DYS389I | 0.95 | 1.8 | 3.0 | 14 of 7862 | ||
| DYS389II | 1.8 | 2.8 | 4.2 | 22 of 7849 | ||
| DYS390 | 1.4 | 2.3 | 3.5 | 21 of 9140 | ||
| DYS391 | 2.0 | 3.0 | 4.5 | 28 of 9089 | ||
| DYS392 | 0.18 | 0.55 | 1.3 | 5 of 9053 | ||
| DYS393 | 0.36 | 0.89 | 1.8 | 7 of 7842 | ||
| DYS437 | 0.60 | 1.5 | 3.1 | 7 of 4672 | ||
| DYS438 | 0.051 | 0.43 | 1.5 | 2 of 4709 | ||
| DYS439 | 3.8 | 5.7 | 8.4 | 27 of 4686 | ||
| DYS448 | 0.19 | 1.6 | 5.7 | 2 of 1258 | ||
| DYS456 | 1.8 | 4.8 | 10 | 6 of 1258 | ||
| DYS458 | 2.8 | 6.4 | 12 | 8 of 1258 | ||
| DYS635 | 1.6 | 3.8 | 7.4 | 8 of 2131 | ||
| GATA H4.1 | 0.71 | 2.2 | 5.1 | 5 of 2294 | ||
| From table 1. Sanchez-Diz et al. 2008. Note some of the N in the 17 STR are quite low in frequency | ||||||
A Y-STR is a short tandem repeat (STR) on the Y-chromosome. Y-STRs are often used in forensics, paternity, and genealogical DNA testing. Y-STRs are taken specifically from the male Y chromosome. These Y-STRs provide a weaker analysis than autosomal STRs because the Y chromosome is only found in males, which are only passed down by the father, making the Y chromosome in any paternal line practically identical. This causes a significantly smaller amount of distinction between Y-STR samples. Autosomal STRs provide a much stronger analytical power because of the random matching that occurs between pairs of chromosomes during the zygote-making process.