Re: [DIYbio] Twins get 'mystifying' DNA ancestry test results (Marketplace) CBC Documentary

Sandwalk has a good post on this. See https://sandwalk.blogspot.com/2019/01/what-happens-when-twins-get-their-dna.html .

Bottom line, identical twins don't have completely identical DNA. In fact, none of us do. If you could completely sequence two different cells from different parts of your body, there would be differences that accumulated during cell division.

However, if the Sandwalk post is correct, the twin comparison was affected mainly by small errors in the test, not because of the true but rare actual differences between the twins' DNA.

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