DNA-NEWBIE-L ArchivesArchiver > DNA-NEWBIE > 2010-08 > 1281827563
From: Nelda Percival <>
Subject: Re: [DNA-NEWBIE] DNA Results
Date: Sat, 14 Aug 2010 18:12:43 -0500
First of all, What test did you do?
Hopefully your talking about Y-DNA and at least 37 markers. The test uses STR markers, and you use all of them.
The full set of markers are needed because they are compared to the same markers of someone else. A relationship between two men is determined by differences in their Y -DNA results.
Example: man A has dys393=12 and man B has dys393=14 there is now a two step difference between them. all differences are accumlative.
A good exmple is at my website:
Start with Group D linage 3 see how they are a perfect match? note the haplogroup= R1b1b2?
The group below that is Group A lineage 1. This group and Group D are related but not with in the time frame of the use of surnames, they have the same haplogroup. Notice Group A - all the men are a perfect match at 12 marks. But start varying at 13 markers. now start counting the differences.
First you need to discover the Common ancestor's estimated haplogroup. You do this by using the average result for each person at each marker. See the common ancestor's results? then you count the differences from the common ancestor, for comparing two men, just count the differences.
In my opinion more then 4 steps differences at 37 markers and they are not related with in the time frame of the use of surnames. But this also depends on other things. What markers mutated? Fast or Slow..?? Are there any other indicators ??
Your Project administrator should help with this...
Nelda L. Percival
SSGT, E6, US ARMY ret.
Now that I have my DNA results which markers should I compare with others' DNA? What are the most important in determining relationships? After I compare them what do I have? I recognize that numbers are the same on certain markers but what does that mean.