GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2004-10 > 1096748230


From: "Terry Barton" <>
Subject: RE: [DNA] Re: GENEALOGY-DNA-D Digest V04 #761
Date: Sat, 2 Oct 2004 16:17:13 -0400
In-Reply-To: <1dc.2ca1a09c.2e902df2@aol.com>


John, I lead a group which has a large Lineage with very few mutations and
reasonably decent pedigrees. However, our 1600s pedigrees don't come
together in a common ancestor. And, when you look at the implied halpotype
of the common ancestor of the separate families, you get 42/42 and 41/42
matches between families. We are taking a select group to 48 alleles and
will be looking to see if we get any additional branching. And, we'll
probably give it a try when some testing lab offers another batch of
alleles.

I can't even imagine (from our experience) a match at 25 markers (at least
23/25) that blows apart at 37 (less than 32/37). What does the traditional
paper genealogy tell you?

Our only similiar example was a 23/26 (that Relative Genetics cautioned us
against assuming as a relation) that went to 32/42. From memory, it has a
genetic distance of 13 now.

Terry



-----Original Message-----
From: [mailto:]
Sent: Saturday, October 02, 2004 12:15 PM
To:
Subject: [DNA] Re: GENEALOGY-DNA-D Digest V04 #761


Allen and LIST
I'm not trying to answer this message, just commenting again on what I
can't understand. This subject keeps coming up again and again with the
answers
from the list that it is just the way it is. If so, then there is limited
value in the DNA information we are getting.
We have three sets of markers, which as I understand it, each set is
equal to the other in their importance. Suppose they develop a forth set
38-49. We
have seen matches on 25 markers go from closely related to completely
unrelated when the subjects go to the third set 26-37. So I presume that you
could
have a definitely related match on 37 markers and then go to a genetic
distance
of 16 just like it has happened on 25 markers. Where does it end, is there a
quantity of markers that will ever let you know positively that you are
related
to someone?
Jack Mc

In a message dated 10/2/2004 9:26:00 AM Central Daylight Time,
writes:
From: "Allen Grant" <>
To:
Message-ID: <002f01c4a823$0140c440$>
Subject: DNA Markers
Content-Type: text/plain;
charset="Windows-1252"

I have recently received markers 25-37 and really do not know how to
interpret the values. From reading the threads from this group, it appears
that there
are a number of "experts" on the topic. Can anyone tell what all these
markers mean, aside from the fact that two people with the same DNA are
related
somewhere back in time? Do some of these markers identify the location from
which the "family" originated? If one does not have an exact match, which
markers
are the most important to suggest a strong connection? To the contrary,
which markers must match to assure a connection?

Another Grant and I had a 25/25 match, with a 50% probability of having a
connection within 7 generations. Now we have 37 markers and a genetic
distance
of 3 and a 50% probability of a connection within 19 generations....I don't
understand this! Locus 30, 32 & 36 are different by 1

This thread: