A genealogical DNA test
examines the nucleotides
at specific locations on a person's DNA
for genetic genealogy
purposes. The test results are not meant to have any informative medical value and do not determine specific genetic diseases or disorders (see possible exceptions in Medical information
below); they are intended only to give genealogical information. Genealogical DNA tests generally involve comparing the results of living individuals to historic populations.
The general procedure for taking a genealogical DNA test involves taking a painless cheek-scraping (also known as a buccal swab) at home and mailing the sample to a genetic genealogy laboratory for testing. Some laboratories use mouth wash
or chewing gum
instead of cheek swabs. Some laboratories, such as the at the University of Arizona
, offer to store DNA samples for ease of future testing. All United States laboratories will destroy the DNA sample upon request by the customer, guaranteeing that a sample is not available for further analysis.
Types of tests
The most popular ancestry tests are Y chromosome (Y-DNA
) testing and mitochondrial DNA (mtDNA
) testing, which test direct-line paternal and maternal ancestry, respectively. DNA tests for other purposes attempt, for example, to determine a person's comprehensive genetic make-up and/or ethnic origins
==Y chromosome (Y-DNA) testing== <!-- a redirect target for links from other articles -->A man's patrilineal
ancestry, or male-line... Read More