DNA Research #DNA Test Results #dna


On 2005.11.29, Pam Weston <pweston@sandboxdp.com> wrote:

I recently received several links to the DNA test I had done on my
father's DNA. The connections are showing up as links to people
through the DNA samples >from their mothers.
I'm afraid I'm just a bit lost. Help please.
First, you should probably email the company that took the tests and
ask them specifcally what was done. I know of at least one company
that explains stuff fairly well in email and phone calls, but indeed
has a somewhat confusing website, especially if you are not used to
scientific jargon.

It sounds like your father provided a sample for both Y-DNA and
mt-dna tests. Y-DNA would only link to men. Mt-dna could link to
women or men, but only through their maternal line (i.e., the
terminal point only can be a man--no ancestor in the middle can be
a man).

If you are linking to dna samples >from other's mothers, it *must* be
Mt-DNA (as far as I know--geneticists can correct me if Im wrong).
Therefore, you are related to these folks via your father's mother's
mother's mother's..etc. (i.e., it can be only through his maternal

I think the tightness of the the link is generally going to be
stronger for Y-DNA matches, because I think the Mtu-DNA features are
looking for features over longer time periods (many generations). A
geneticist can explain it better.

A female does indeed inherit DNA >from her father, but only in the
form of X chromosomes. A Y-DNA test can only test DNA >from a
Y-chromosome (which only males have). So, though you get DNA from
your dad, there isn't yet an available test that can trace this (at
least not for the purposes you mention).

In other words, the tests that are now available can not equally
test for relationships amongst any two people.

A male can only test a pure male line and his pure maternal line,
generally with tighter results for the Y-DNA. A female only test a
pure maternal line. You would need a male relative such as a father

There must be tests out there that can test for more general
relationships (paternity tests work on female babies, don't they>),
but for whatever reason they can't be adopted for genealogical
purposes at this point. Perhaps someone else can explain why. Are
they only accurate over one generation?

Steve Bloom
Farmville, VA

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