Mailing List:2002-10-01 01, Re: DNA, by Karl H. Schwerin

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Mailing List Archives > 2002-10-01 01, Re: DNA, by Karl H. Schwerin

From: karl h schwerin <schwerin -at-> Subject: Re: [WHITNEY-L] DNA Date: Tue, 1 Oct 2002 12:09:10 -0600 (MDT) In-Reply-To: <> On Mon, 30 Sep 2002, Sally Towns wrote: > I personally am the first female to break the line of male decendents of > John family- I am the 10th. generation- including John 1. I won’t qualify > for any testing but have a close friend who is from the John line who is a > male direct line. I believe he is also 10th. generation including John, > think he might be very interested in participating, but lets move fast He is > in his late 70’s and not to well. > > Sally Whitney Towns > > PS I will again ask – How do you prove paternity for a daughter to her > father with DNA??? In the case of a father, half your DNA comes from him. It would be fairly easy to prove that someone is NOT your father, merely by testing for blood groups, such as ABO, Rh+/Rh-, MNSs, etc. Only you and your father would share certain combinations, thus ruling out anyone who did not have those combinations. That still leaves a rather larger pool of possibilities, however. In forensic tests the lab generally looks for about 20 "markers" from different chromosomes. If you match one parent or the other on all of those, it is pretty convincing proof of your genetic relationship. If there is still doubt, it is possible to test for additional markers. The problem is that that degree of testing is expensive. Another problem is that the time depth is shallow. Since you receive only half of each parent's chromosomes (23 pairs), it only takes about 6 generations (statisticly) to lose all the chromosomes of a given ancester. Of course, there's alwasy a possibility that a particular chromosome survives much longer, but there is no way to be sure of that in a statistical sense. In my case, since I am 11th generation descendant from John & Elinor, with a shift of sex in the line with my grandmother and mother, it is extremely unlikely that I still carry any of the original J&E genetic material. Karl SchwerinSnailMail: Dept. of Anthropology Univ. of New Mexico Albuquerque, NM 87131 e-mail: schwerin -at- Cultural valuable because it is constantly rediscovering the normal. Edward Sapir (1949:151)

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