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Archiver > GENEALOGY-DNA > 2005-09 > 1127348809


From: "Ken Nordtvedt" <>
Subject: Re: Felstead TMRCA, hg E3b (was Re: [DNA] SMGF adjustments to FTDNA values)
Date: Wed, 21 Sep 2005 18:26:49 -0600
References: <380-220059220214337977@M2W087.mail2web.com> <43308839.6020402@dna-fingerprint.com> <REME20050920182157@alum.mit.edu> <op.sxfa9wsxpqnhvj@pablo> <009001c5be39$39effe50$0100a8c0@chrissam> <op.sxfdbclzpqnhvj@pablo> <00c101c5be3e$424f7300$0100a8c0@chrissam> <001c01c5beb5$a6d62fe0$0100a8c0@chrissam> <op.sxg1kudbpqnhvj@pablo> <003e01c5bf02$b79062e0$0100a8c0@chrissam> <op.sxg849xapqnhvj@pablo>


Someone studying subclade E3b may know if it has some strong modals at the
markers 448, 449, and C4m and what they may be? If the differences in these
markers for the 4 haplotypes by themselves are basically neutral in
providing evidence of which values are closer to the common ancestor, I'd
argue that the values closest to the modals for that subclade are the more
likely values for the common ancestor.

Ken
----- Original Message -----
From: "David F Reynolds" <>
To: <>
Sent: Wednesday, September 21, 2005 6:04 PM
Subject: Re: Felstead TMRCA, hg E3b (was Re: [DNA] SMGF adjustments to FTDNA
values)


>A haplotype is a specific set of marker values, i.e. the four Felstead
>entries discussed below are four separate haplotypes, as they are four
>distinct sets of values. Your son and yourself, assuming that all marker
>values match exactly, would share a single haplotype.
>
> Your specific haplotype consists of the marker values returned by FTDNA &
> SMGF for your genetic sample.
>
> A haplogroup is a set of haplotypes that is defined by specific slowly
> mutating markers. In the case of you and your distant cousins, even though
> your haplotypes are slightly different, you are all likely in haplogroup
> E3b. The common ancestor for haplogroup E3b lived many thousands of years
> ago, so two people both being in haplogroup E3b does not guarantee any
> genealogical connection, though. But if a Felstead is not in E3b, you are
> absolutely not related to them, within any meaningful timeframe.
>
> Given enough data points from living descendants, the haplotype for the
> common ancestor can sometimes be deduced. In your case, because you and
> the other three gentlemen have exact matches on 33/36 markers, then the
> odds are extremely high that your mutual common ancestor would have the
> same have same values as the four of you on those 33 markers. For the
> other three markers, given the small number of datapoints, with values
> evenly split between the four of you, it is impossible to say what the
> value was for your common ancestor. For DSY448, for example, some
> descendants have a value of 20, some a value of 21, so the most likely
> scenario is that your common ancestor had one or the other. (This is
> deliberately ignoring complicating factors which can occur, such as
> parallel or back mutations.)
>
> In any event, given the closeness of the matches and the even split
> between the differing values, it really doesn't make any difference in
> your case -- all three of the other Felstead lines are definitely worth
> following up on.
>
> Regards,
> david
>

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