Y-chromosome DNA, passed from father to son, helps men trace their paternal ancestry, often tying surnames to specific lineages. For example, Y-DNA testing can confirm if two people with the surname Smith share a common male ancestor. Projects like the International Society of Genetic Genealogy map Y-DNA haplogroups, such as R1b, prevalent in Western Europe. This tool is especially useful for surname studies or tracing clan affiliations, though its only available to biological males.
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