I think the DNA tests are very useful to determine human migrations
and how large populations have intermingled. For men, they can also
show if you are related to others with your surname and perhaps
something about the origins of the surname line. But since women
don't typically maintain a single surname line, they unfortunately
don't share this benefit.
I don't think is very surprising that those of us descended from
European ancestors find all sorts of genetic origins in our
markers. The history of Europe is one of constant invasions. The
Celts, Saxons, Tartars, Romans, Gauls, Huns, Ottomans, etc, etc have
all at one time or another invaded somewhere else in Europe. My
guess is that if it were possible to decode the other 45 chromosomes
in our bodies in addition to the Y chromosome or the Mtdna, we would
each find evidence of most of the above groups in our genetic makeup.
Anyway, it is interesting. And please thank your sister for her
--- In SLOVAK-ROOTS@yahoogroups.com
, helene cincebeaux
> Carl Kotlarchik <kkotlarc@...> wrote: I have been fascinated by
all the discussions on DNA markers etc. But
> I remain confused about some aspects of the research. For
> for men, the Y chromosome is passed from father to son so it is
> possible to follow this one ancestral path back. But this only
> you about one path. In ten generations, you have 1024 ancestors
> which half (512) would be men. But when you just trace the Y
> chromosome, you are only looking at 10 of these men. Since your
> makeup also contains information from the other 502 men and 502
> you are looking at a really small percentage of your makeup aren't
> What prompted my question is that Helene said in her posting that
> sister was more "Oriental than Caucasian". But is this really the
> case since she similarly is just looking at one specific maternal
> line. The other 99% of her makeup could be something entirely
> different. It just seems to me this testing tells you a very
> amount about your ancestry. What am I missing?
> Hi Carl - sent your comments to my sister, Dr. Rosalie Baine,
and this is her reply, "He is correct about me - it's only my HL-A
and one Igg gene that are "Oriental" - I don't really know about the
rest of my genes which could all be pure Caucasian. We are talking
about genes which are inherited on various chromosomes, so a lot of
variation would be expected.
> The Y is different. Since all the Y genes are, by definition,
on the same chromosome, they tend to inherit as a group. It can
change a bt over time - by mutation, by internal crossover, maybe be
corssover with chromosomes with a similar internal structure (if
any). But the Y is pretty small, which decreases the probablilty of
recombination. Chances are that his Y chromosome is pretty similar
to that of his 200 generation back forefather. Obviously, his Y
won't include any information from his maternal side at all,
although he may have other genes from that line. His Y just tracks
his direct male ancestor, not any of the others.
> However, since the Y tends to inherit as a unit, it is very
useful for tracking population movement. Similarly, the
mitochondrial DNA comes completely from the maternal side and will
not reflect any of his ancestors on the paternal side and only the
direct line of his mother.
> To sequence anyone's entire genome is a monumental undertaking
and can't be done now. We can just look at certain markers. Pop
geneticists concentrate on the Y and mitodhondria because they are
interested in looking at population levels.
> So it is true that Y chromosome gene markers tell us very little
about a person's total genome, but does help place a person in the
context of those with similar or identical Y's."
> I THINK I UNDERSTAND IT A BIT BETTER NOW.
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