GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2005-12 > 1133466610


From: Robert Stafford <>
Subject: Re: [DNA] upgrades
Date: Thu, 1 Dec 2005 11:50:10 -0800 (PST)
In-Reply-To: <004e01c5f699$a825b5c0$5102a8c0@PC238587905109>


Chris,

Generally, I just use the number of matches and then examine the two-steppers separately. For the single-copy markers that RG uses and the time spans that we normally are able to document, they seem to be unusual. The only multi-step mutation that we found among 35 people with documented genealogies was at DYS385. It was likely a recLOH event.

Bob Stafford



Chris <> wrote:
Dear Bob and others,

Thanks for your replies.
"Are you PCA7Y and the other person T84DA?" Yes you are quite right. I'm
not expecting a close realtionship here being as I understand it a genetic
distance of 4. We match on 29 markers out of 32.

"Did you subtract 1 from your RG value for Y-GATA-H4? It would be unusual
for close matches with a common surname to have a 2-step difference on it."
. I didn't but does having a two step difference in your mind decrease the
possibility of a connection within the time frame of surnames?

I know there are arguments regarding the mutation rates used by FTDNA but
using their rates this gives a probability is 50% that the TMRCA is no
longer than 12 generations. And 95% 25 generations. I am aware that some
argues that this should be multiplied by anything from one to two and a half
times.


I didn't subtract one, but note that Y-DNA Comparison Utility does do this
in certain formats eg the SMGF database configuration.

Cheers,
Chris


> Bob Stafford
>
> Chris wrote:
> Hi Folks,
>
> I had my 43 marker test via Relative Genetics. I've just found, on
> Ysearch, an individual with the same surname and a very distant match.
> However they tested with Family Tree DNA. They tested on 37 markers. But
> being different companies we can only compare on 32 markers.
>
> The question is there a company which would test me for FTDNA's 5 markers
> (not covered by Relative Genetics). And this matching individual on the
> markers I've tested on (Relative Genetics) but they have not been tested
> on with FTDNA?
>
> Cheers,
> Chris
>
>
>
> ==============================
> Search Family and Local Histories for stories about your family and the
> areas they lived. Over 85 million names added in the last 12 months.
> Learn more: http://www.ancestry.com/s13966/rd.ashx
>
>
>
> ==============================
> New! Family Tree Maker 2005. Build your tree and search for your ancestors
> at the same time. Share your tree with family and friends. Learn more:
> http://landing.ancestry.com/familytreemaker/2005/tour.aspx?sourceid=14599&targetid=5429
>
>



==============================
New! Family Tree Maker 2005. Build your tree and search for your ancestors at the same time. Share your tree with family and friends. Learn more: http://landing.ancestry.com/familytreemaker/2005/tour.aspx?sourceid=14599&targetid=5429


This thread: