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Subject: [PACE] Question for Rebecca
Date: Mon, 29 Jun 2009 03:53:52 -0700 (PDT)

Rebecca, if you have time, could you explain a little more about which DNA markers should be regarded as more significant, in distinguishing one group from another?

My particular question is, why is it that Markers 6 and 20 are considered to define the modal for Group 3A, with Group 3B distinguished from 3A on the basis of the difference in those two markers?

Group 3A has Marker 6=14 and Marker 21=29 (22 participants)

Group 3B has Marker 6=12 and Marker 21=30 (16 participants)

Four other participants have Marker 6=14 and Marker 21=30 (#122167, #26541, #21419, and #19490)

To me, as a non-expert, it almost looks as if the four could be part of a sort of "intermediate" group between Group 3A and Group 3B. I assume this is not so, otherwise the experts would have said so, but I don't understand *why* it's not so. Can you explain?

Thanks.

James Blair

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