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Fraternal twins are the product of two separate combinations of ovum and sperm at the same time, resulting in genetically different children with a shared womb.

Identical twins are the result of one ovum-sperm combination, which then splits into two separate children who are genetically identical.

If the two children born from one pregnancy are genetically near 100% identical (with consideration for mutations and genetic alterations after the split or post-natal), they are identical.

If the two children have closer to normal sibling genetic similarity (around 50%) but just share a birth time, they are fraternal.

Also, identical twins share the same gender. If twins are of different gender, they must be fraternal (though fraternal twins can be same gender as well).

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15y ago

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