Ancestry.com DNA Overview - Discover genetic genealogy and ancient ancestry with a DNA cheek-swab test. Find leads based on DNA testing, surnames, geography and haplogroups. Expand your family tree, find potential genetic cousins, see maps and make connections. Learn about the science, lab work and value of your genes in tracing your personal family history. We explain and help you choose a mitochondrial (mtDNA) or Y-chromosome lineage test in a few easy steps.