DNA Research #DNA Re: False negatives in Family Finder test #dna


Judy Simon
 

There is a lot of randomness in the process of passing autosomal
chromosome segments to the next generation; by the luck of the draw,
it is possible for a woman and her sister's grandson to have no
segments in common in the Family Finder test, yielding a false
negative test. I don't think this this situation is common, but I
don't have enough knowledge and experience to put a probability on it.
There are others on the SIG who know more than I do, so hopefully
someone will come up with an estimate.

Judy Simon
Stony Brook, NY

On Sat, Jul 21, 2012 at 6:12 PM, Gary Mokotoff <mokotoff@earthlink.net> wrote:

It is my understanding that the Family Finder test of Family Tree DNA can
produce false positives, that is, two people may show close kinship but
actually may not be that closely related.

My question is whether the Family Finder test can also produce false
negatives. Specifically, I tested a woman and a man that hopefully was her
grandnephew (her sister's son's son). There was no Family Finder match.
Does this unconditionally conclude that they are not related? If false
negatives do occur, does anyone know at what rate given the kinship
described above?

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