But just how common is it to have an identical twin?
According toHealthline, identical twins account for approximately three or four out of every 1,000 births.
However, not everyone has the same chance of giving birth to twins, let alone identical twins.
The odds of having twins increases if you use fertility treatments, according toVerywell Family.
Interestingly, the chances of having identical twins remains the same with or without treatments.
Why do some fraternal twins look so alike?
Mary-Kate and Ashley Olsenare arguably the most famous twins in the world.
However, they’re actually fraternal twins, not identical twins (viaE!
Let’s revisit some science.
Fraternal twins are scientifically called dizygotic twins, a name that references two fertilized eggs (viaScienceDirect).
Therefore, the twins may be different genders or look nothing alike.
Another theory, according toBetter Health Channel,is that there’s a third key in of twin.
Referred to as semi-identical twins, they fall somewhere in between fraternal and identical.
However, semi-identical twins appear to be extremely rare (viaCNN).
