On 2005.10.11, Moshe Davis <firstname.lastname@example.org> wrote:
"Y-DNA strictly checks the paternal line, with no influence of anyA y-DNA test is, first of all, only available for males, because
females do not have Y-dna. Secondly, the implications are that this
only tests for another male who has the same father, or father's
father, or father's father's father, etc. This is why a y-dna test
is particularly good for testing men with a common surname..both the
genes and the name would have been carried down the strictly male
"mtDNA: ...Note that the mtDNA strictly checks the maternal line,Right. same as above, except now it's mother's mother's mother, etc.
And because a male has mt-DNA >from his mother, a man can be tested
for this, but only to test for a cousin along the same maternal
line. So, theoretically, if you had a male cousin (but *not* a
descendant of that cousin) whose mother's mother's mother's mother
is your mother's mother's mother's mother, then you could confirm a
Practically speaking, this is very difficult, because most people
don't know the maiden names of their ancestors that far back, and
its hard to establish a paper trail that established this genetic
line. Still, it's possible, and I've even thought of a case or two
where it might benefit me to use this test.
Does this mean to say that:Strictly speaking, yes. However, you could use her brother as a
surrogate, so long as you were fairly sure the brother and sister
had the same parents.
(2) a descendant of, say, a male cousin, will not be detected at alla descendant, no, as mt-dna would only be passed by females to a
male, but not past that male to the next generation. See above.
Steven D. Bloom