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Re: Understanding DNA
Posted by: Robert Stafford (ID *****6330) Date: May 01, 2012 at 11:57:16
In Reply to: Re: Understanding DNA by Chuck of 4712

There is nothing particularly special about a perfect match, except that it means that there is more of a chance of finding the common ancestor earlier.

The TMRCA calculation just gives you the odds of finding the common ancestor by a certain number of generations, but it is not precise enough to distinguish the actual number of generations because of the overlap. For example, the ranges for various close matches are:

0.5-8.0 generations for a 67/67 match
1.5-12.0 generations for a 66/67 match
3.0-15.5 generations for a 65/67 match
5.0-18.5 generations for a 64/67 match

Questions 23=27 on the following page show how to interpret results:

http://www.familytreedna.com/faq/answers.aspx?id=9



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