What side of the family do twins run on?


Quick Answer

The mother's side of the family is responsible for non-identical twins, also called fraternal twins. There is no family history when it comes to identical twins.

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Full Answer

Identical twins result from the same egg after fertilization. Twins who are not identical result from two separate eggs that the body releases simultaneously. It is a genetic trait that causes the simultaneous release of two eggs and this generally passes from a mother to a child. This is not always due to genetics, however, because women more than 30, but less than 35 years of age have a higher risk of simultaneous egg release than younger women.

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