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DNA twins

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Whickerman | 19:37 Sun 25th Feb 2007 | Science
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Just curious - what's the chances of having a DNA twin? What are the odds of two people having the same DNA, and at what stage is it a certainty that there's another with the same DNA pattern?

(Background: you hear that there's a one in xxxxnumber chance of DNA match being wrongly applied, yet surely a finite number of options must be reached as populations grow, and then taking race into account the odds must get slashed? If at all possible, a statistical answer would be appreciated, thanks)
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Sorry - meant to specify, I mean where two people aren't, say, twin siblings...

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