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Fraternal Twins vs. Identical Twins. Fraternal twins are âdizygotic,â meaning that they developed from two different eggs fertilized by two different sperm cells, while identical twins are âmonozygoticâ i.e., they developed from a single fertilized egg that split.
The two couples had a double wedding in 1999 after the brothers proposed on the same day. Taking the twin theme a step further, Craig and Diane had identical twin boys, Colby and Brady, in 2001. Identical twins have no hereditary traits that influence a predisposition to having identical twins. No one knows why identical twins happen, as they come from a spontaneous split of a fertilized egg.