Fraternal twins and identical twins differ in their genetic makeup. Fraternal twins are formed when two separate eggs are fertilized by two separate sperm and develop into two separate embryos. As a result, fraternal twins are no more genetically similar to each other than any other siblings and usually share about 50% of their genetic material, just like in a brother or sister relationship.
Identical twins, on the other hand, are formed when a single fertilized egg splits into two embryos. These twins share 100% of their genetic material and are genetically identical. This is why identical twins have the same genetic makeup and often look very similar to each other.
By taking the SecuriGene At Home Twin DNA test, you can conclusively determine whether a pair of twins are Fraternal Twins or Identical Twins.