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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.
So when one egg is fertilized by single sperm then identical twins or mono zygotic are born and they are always of same sex. But when two different eggs are fertilized by two different sperms then fraternal twins are born. In fraternal twins sex of both twin are irrespective of each other .