In the US, the incidence of fraternal (dyzygotic) twins is 32 in 1000 live births.
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Fraternal twins are more popular.
Another name for fraternal twins is dizygotic twins.
Fraternal twins can be the same sex or opposite sexes. It doesn't matter.
Yes, fraternal twins are perfectly normal.
Fraternal twins are two siblings that have the same birth day, but do not look identical.