Re: [forensic-science] daughters of different mother? DNA and what can it tell?


At 02:05 PM 6/14/2011, Gurl wrote:
> Woman alleged to be the mother of two woman. However, siblings remember
>the possibility that the mother of one of the girls, was actually the
>sister of the alleged mother. That the "mother" took her sisters
>daughter and raised her as her own.
>Since mt-DNA follows the maternal line, how is one to be able to
>determine using DNA if the two woman are sisters?

Right, mt-DNA wouldn't help. But autosomal DNA typing, which is cheaper and
more common (e.g. routine for paternity testing) will to an extent
depending on luck distinguish the two scenarios.

>If the father is different (as I suspect would be the case) what other
>definitive evidence could be gather using DNA to determine if the woman
>are of the same mother?

Nothing in the real world is ever definitive. Not 100%.

>There is the possibility of gathering DNA from both "daughters" and a
>brother. Father is deceased.

Given the availability of the brother, the evidence is likely to be very
strong -- about a 95% chance to have 99% certainty one way or the other
assuming 50% each way a priori. It just a matter of finding a lab that is
willing to do the testing and knows how to analyze the result -- which in
practice probably means that they use the DNA-VIEW software (disclosure --
software that I provide).

Charles Brenner

Recent Activity:
To subscribe send a blank e-mail to:
To unsubscribe send a blank e-mail to:

Group home page:
From the home page you can search the list archives.  It also includes links to forensic science sites and allows you to modify your account settings.

Find useful articles and helpful tips on living with Fibromyalgia. Visit the Fibromyalgia Zone today!

Stay on top of your group activity without leaving the page you're on - Get the Yahoo! Toolbar now.




Post a Comment