Friday, 17 May 2013

Step 3.4 - Using phasing to eliminate grandparental lines

This is a very complicated and time-intensive approach and requires testing multiple people to identify what parts of your DNA were inherited from which of your 4 grandparents. Testing might include at least 1 parent, 3 siblings, and several cousins.

The value of this approach is that it will potentially eliminate 3 of your 4 grandparental lines and in so doing reduce the number of possible contenders for Common Ancestor to a mere 25%. Taken in conjunction with the other techniques described in this blog, this can considerably narrow down the number of possible candidates for Common Ancestor.

The ISOGG wiki has a summary of phasing and how to do it. It also has some useful references at the end.

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