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Titel: Äldre inlägg (arkiv) till 26 maj, 2010
Skrivet av: Rolf Berlin skrivet 2005-11-26, 23:00
Citerar Familytreedna.com förklaring på engelska
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Understanding MRCA  
1. If I submit a sample to you for testing and you find that I match exactly with another person, how many generations ago did we have a common ancestor?  
 
Here are the times back to the MRCA when ALL the markers match. Those numbers are based in the latest results of the mutation rate study conducted by the University of Arizona. For example, with 37/37 (all 37 markers match), there is a 50% probability that the MRCA was no longer than 2 generations, and a 90% probability that the MRCA was within the last 5 generations. Compare these with 25 and 12 -- with 25 markers, there is a 50% probability that the MRCA was within the last 3 generations, while with 12 markers, there is a 50% probability that the MRCA was within the last 7 generations.