What DNA markers do they use in paternity tests?

Paternity tests typically use short tandem repeats (STRs) as DNA markers, which are specific sequences of DNA that vary in length among individuals. Commonly, 15 to 20 STR loci are analyzed to assess the likelihood of a biological relationship. Additionally, mitochondrial DNA and Y-chromosome markers may also be used in certain cases, especially for maternal lineage or male lineage testing, respectively. The combination of these markers provides a highly accurate determination of paternity.