With the addition of DNA testing becoming more widely and actively used by genealogists, many researchers find themselves wanting to know more about testing, and, signing up to be tested. Since there are now more online web sites that offer DNA testing service than there were 6 or 8 years ago, the following list of links are some of the more well known that answer questions and perform the testing for applicants. Fees for each vary, so shop around before deciding.
DNA Heritage ~ http://www.dnaheritage.com/ ~ over 75,000 database records
Family Tree DNA ~ http://www.familytreedna.com/default.aspx ~ over120,000 database records
Genetic Genealogy ~ http://www.dnaancestryproject.com/index.php ~ thousands of database records
My Genetic Heritage ~ http://www.mygeneticheritage.com/ ~ thousands of database records
National Geographic's Genographic Project ~ https://www3.nationalgeographic.com/genographic/index.html ~ over 78,000 database records
Sorenson Molecular Genealogy Foundation ~ http://www.smgf.org/ ~ over 70,000 database records (Free service)
ysearch ~ http://www.ysearch.org/ ~ over 54,000 database records