Which type of twins are formed from two separate fertilized eggs?

Fraternal twins, also known as dizygotic twins, are formed when two separate fertilized eggs develop simultaneously in the uterus. During conception, if two eggs are released from the ovaries and each is fertilized by a different sperm cell, the result is two genetically unique siblings who share about 50% of their DNA, much like any other pair of siblings. This genetic diversity arises because each twin has its own distinct combination of genes inherited from both parents.

In contrast, identical twins, or monozygotic twins, come from a single fertilized egg that splits into two embryos. This results in twins that are genetically identical and share the same DNA. Diaphanous twins is not a recognized term in the context of twin classification. The key distinction is that fraternal twins originate from two different eggs and sperm, leading to genetic variability, while identical twins arise from one egg.