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Identical twins are born when a single fertilized egg splits an extra time early on to produce two copies that develop into two different babies. Identical twins MUST have a single father because they come from a single egg fertilized by a single sperm.

Fraternal twins could, in theory, be born from separate fathers since they come from the fertilization of two different eggs. The scenario for this is a bit skanky though, so I prefer not to think about it too much. Note that fraternal twins may appear identical but usually look noticeably different even when they share the same father since they come from two separate eggs fertilized by two separate sperm. If the fathers were different, the odds of even looking close would be significantly diminished.

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13y ago

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