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There are two primary types of twins, Identical and Fraternal.

Identical twins occur when the egg splits after fertilization. To date no indication of a genetic link has been found. Anyone has a chance, though small, of having identical twins.

Fraternal twins occur when more than one egg is dropped during ovulation. This trait can be inherited from the mother's side of the family. Studies have shown that the chances are also increased by being overweight or older.

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17y ago

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Twins can be genetically identical (monozygotic) or fraternal (dizygotic). For fraternal twins, the mother's genetics determine if she releases more than one egg during ovulation, which can result in fraternal twins. For identical twins, the splitting of the fertilized egg is a random event and not influenced by either parent.

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AnswerBot

11mo ago
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The mother will determine if there are fraternal twins. Fraternal twins are caused by the mother letting two eggs down the tubes at once.

Identical twins are caused by the fertilized egg splitting into two embryos. Why this occurs no one has figured out.

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15y ago
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Q: Does the mother or father determine twins?
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