MAXWELL-L Archives

From:
Subject: Test probabilities
Date: Thu, 11 Aug 2005 15:51:22 EDT

This FAQ was taken off the FamilyTreeDNA webpage
(_www.familytreedna.com/faq.html_ (http://www.familytreedna.com/faq.html) )
Hope it answers some questions. The above webpage also offers data about
testing on the female side with mitrochondrial DNA and what progress is being
made.
17. How far back can you determine a genetic link?
All genetic tests from Family Tree DNA will provide you a probability that
you and another person, who have an exact match, will have your Most Recent
Common Ancestor (MRCA) within a range of time backwards. Our 12 marker test
gives you the following range: 7 generations (50%) likelihood & 29 generations
(95%) likelihood. Using our 25 marker test the 50% likelihood drops to 3
generations and the 95% to 13 generations. The 37-marker test tightens further to
2 generations (50%) and the 95% to 7 generations. We have also incorporated
all of our marker mutations rates into our new FTDNATiP calculator. See the
new _Table 1_ (http://www.familytreedna.com/faq2.html#table1) .
(FTDNA is in Houston, TX, and the DNA labs are in the Univ. of Arizona.
Seven generations would be about 175 to 275 years....Max)

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