![]() ![]() Y-STR tests are used for genetic genealogy purposes within surname projects to test hypotheses about patrilineal relationships and to investigate questions about surname origins. SNP testing is used for deep ancestry purposes to provide information about your haplogroup which tells you which branch of the Y-DNA tree you belong to. ![]() The information you receive depends on which and how many markers of each type are tested. These markers have different mutation rates and so give information at different time depths. The markers tested are of two types: STRs (short tandem repeats) and SNPs (single nucleotide polymorphisms). Among the tests currently available there is much variety in the amount of information provided. Only males carry a Y-chromosome, but a female can learn about her father line, for example, through her father or brother. A Y-chromosome DNA (Y-DNA) test provides information about your male line ancestry only, which in most cultures corresponds with the inheritance of surnames. ![]()
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