Fraternal Twins vs. Identical Twins Diffen › Science › Biology › Microbiology Fraternal twins are “dizygotic,” meaning that they developed from two different eggs fertilized by two different sperm cells, while identical twins are “monozygotic” i.e., they developed from a single fertilized egg that split. read more
Identical twins develop from one fertilized egg that splits into two parts, while fraternal twins are born from two different eggs and sperm cells. In both cases, the twins share the same womb and are usually born within moments of each other. read more
Other times, a family may see the minor differences in identical twins and declare the twins fraternal based on these differences in appearance. There are a few commercial laboratories that, for a fee, will send families DNA collection kits to determine if the twins are identical or fraternal. read more