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A genealogical DNA test is a DNA-based test which looks at specific locations of a person’s genome in order to determine ancestral ethnicity and genealogical relationships. Results give information about ethnic groups the test subject may be descended from and about other individuals that they may be related to.
Three principal types of genealogical DNA tests are available, with each looking at a different part of the genome and useful for different types of genealogical research: Autosomal, Mitochondrial, and Y. In general, genealogical DNA tests do not give information about medical conditions or diseases.