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From:
Subject: Re: [DNA] Markers YCA II a&b
Date: Mon, 02 Aug 2004 15:28:29 +0000


In the available research literature it is clear that YCAIIa,b is extremely stable - at least in relation to certain haplogroups.
R1b is virtually all 19,23. R1a, which has been the subject of three studies (Passarino et al., 2002; Quintana - Murci et al., 1999; Passarino et al., 2001), is largely 19,23. What is particularly interesting is that the 2002 study found that YCAIIa,b is bimodal in Norway for R1a. 9 of 17 had the motif 19,23 which is virtually universal in all regions of the world studied to date (studies do not include Central or East Asia). However 7/17 Norwegians had a 19,21 motif which is virtually unknown elsewhere.
The research literature would not support your assertion that this marker complex is volotile - quite to the contrary.
David.


--
Dr. David K. Faux
P.O. Box 192
Seal Beach, CA 90630


www.davidkfaux.org


-------------- Original message --------------

> 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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