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[BOC]
It's unlikely that it would be the *exact same* mutation, even if it caused the same blue-eyed effect. Blue eyes are caused by a particular mutation on the HERC2 gene that effects the neighboring OCA2 pigmentation gene and causes it to not express completely, resulting in blue eyes. The mutation is probably a single DNA "letter" in the HERC2 gene. The probability of the exact same mutation occurring twice is much smaller than the probability of a different mutation occurring and having the same effect. 
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