GENEALOGY-DNA-L Archives

From:
Subject: Markers YCA II a&b
Date: Mon, 2 Aug 2004 10:20:20 EDT

Most of the cousins in our Renshaw project who tested on 37 markers match
exactly on YCA II a&b. They have values of 19, 23.

One man, however, tested as 15, 19. See our webpage at
http://www.renshawdna.com/charts.htm and look at the pink block, fourth line, labeled GAR. You
will note that I reversed the values for his results at marker YCA II a&b so that
he is shown as 19, 15, giving him a one-step mutation at YCA II b using the
infinite alleles model. This reversal is legitimate, I believe, as the order
of the results on these two markers is based solely on convention?

Because GAR is a fifth cousin to the man labeled CPR, whom he only matches
34/37 even using the infinite alleles model on YCA II b as above, we tested GAR
at DNA Heritage as well as at FTDNA. You may be interested to know that with
the exception of TAGA H4 and GATA H4, which should have a difference of 1 at
the two labs and did, the numbers matched exactly on all markers that were
measured by both labs.

We have learned a few things from this exercise:

1. The labs are accurate
2. Fifth cousins can match only 34/37.
3. YCA II a&b is much more volatile than we might suppose. It should be in
red on the FTDNA charts

Lest any of you think that perhaps the paper trail is wrong and the two
cousins are not really related, note that they both have the odd value of 20 at
marker #570. Comparatively few R1b's have this value, so we use it to confirm
relationship within our project.

Comments, please?

Eleanor Gordon
Renshaw Y-DNA Project Co-Administrator

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