Three Types of Twins

We all know there are two types of twins identical and fraternal.

Now scientists are adding a third category to the list., semi-identical twins.

Researchers say, semi-identical twins are more genetically alike than fraternal twins, but not genetically identical like identical twins.

Semi-identical twins are created when two different sperm cells fertilize a single egg, which then splits apart.

Doctors say cases of semi-identical twins exist, they just haven't been identified.

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