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Identical twins happen when a single embryo splits in two soon after fertilization. This is why identical twins have identical DNA. They came from the same fertilized egg. ... Fraternal twins can only happen if a mother releases two eggs in one cycle.
Scientists used to think that identical twins turned out differently because they were treated differently — by friends or teachers or their parents, Turkheimer says. ... Studies show that siblings often start out with very similar personalities or intelligence, Turkheimer says.
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