A Zygosity DNA Test determines whether two individuals are fraternal or identical twins.

• Identical twins develop from a single fertilized egg that splits into two, and each half, carrying identical DNA to the other, develops into an individual fetus.
• Fraternal twins develop from two separate eggs, so they have different DNA from each other. Those two eggs are fertilized separately but at the same time and grow together during a single pregnancy.
• This is an informational test to determine fraternal or identical twinship