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A genealogical DNA test is a DNA-based genetic test used in genetic genealogy that looks at specific locations of a person's genome in order to find or verify ancestral genealogical relationships, or (with lower reliability) to estimate the ethnic mixture of an individual.
Genetic genealogy is the use of genealogical DNA tests, i.e., DNA profiling and DNA testing, in combination with traditional genealogical methods, to infer genetic relationships between individuals. This application of genetics came to be used by family historians in the 21st century, as DNA tests became affordable.
A Y-DNA test analyzes similarities in Y-chromosome DNA markers, corresponding to specific locations on the Y chromosome. Markers have a Short tandem repeat (STR) that involve repeats of 2–5 DNA base pairs. At Sorenson labs, the number of STRs in a 36-marker haplotype was compared between the sample given and the database to determine relatedness.
Genetic testing, also known as DNA testing, is used to identify changes in DNA sequence or chromosome structure. Genetic testing can also include measuring the results of genetic changes, such as RNA analysis as an output of gene expression, or through biochemical analysis to measure specific protein output. [1]
But aside from lost family members, there is so much you can learn from genealogy sites like Ancestry, and if you've been holding off on getting your own DNA test, now's the time to pick one up ...
The International Society of Genetic Genealogy (ISOGG) is an independent non-commercial nonprofit organization of genetic genealogists run by volunteers.It was founded by a group of surname DNA project administrators in 2005 to promote DNA testing for genealogy.