How do dna test determine which specific dna sequences come


Problem

Is it possible that "monozygotic" (identical) twins have slightly different DNA? If so, through what process could such a thing occur such that it shows up on a DNA test like in the following video? How do DNA tests determine which specific DNA sequences come from where (e.g. "your DNA shows that you're 16% Eastern European..."), and is this an accurate process? (Watch the YouTube video "Twins get 'mystifying' DNA ancestry test results (Marketplace)" and pay special attention at 15:59)

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Biology: How do dna test determine which specific dna sequences come
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