Genetically, monozygotic twins are no more similar to each other than are other siblings that are conceived and born separately.

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Monozygotic twins, also known as identical twins, are formed from a single fertilized egg that splits into two embryos. Therefore, they have identical DNA. Other siblings born separately (i.e. dizygotic or fraternal twins) are formed from two separate fertilized eggs and therefore have different genetic makeup.

Genetically, Monozygotic Twins Are No More Similar to Each Other