How can Y chromosome testing trace a male paternal line?

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Large illustrated genealogical tree with detailed branches and leaves, featuring family names and a central family crest, representing the Lippincott family lineage. — Genealogy Genealogical tree of the Richard and Abigail Lippincott family in America, constructed and published by Charles Lippincott, 1880.

Y chromosome testing is a powerful tool in genealogy that allows researchers to trace paternal lineages by analyzing the Y chromosome, which is passed exclusively from father to son.1

Because males who share a common male ancestor possess matching or highly similar Y chromosomes, scientists can compare these genetic profiles to determine distant relationships between individuals. This method is particularly useful for genealogists seeking to confirm whether males who share the same surname are biologically related. By identifying these genetic similarities, researchers can reconstruct paternal ancestry and establish connections that may not be documented in traditional oral or written pedigrees.1