Definition
A *fraternal twin*, also known as a *dizygotic twin*, is what happens when two separate eggs are fertilized by two separate sperm. Basically, they're just siblings who happen to be born at the same time. 👯 They share about 50% of their genes, just like any other brother or sister. They can be the same sex or different sexes. Think of them as siblings who shared the womb. They are as genetically similar as normal siblings, not identical copies.