Genetic similarity
Identical twins usually share almost all DNA. Fraternal twins are genetically similar like any siblings, sharing around half of their DNA on average.
Facts Article
Identical vs fraternal twins
The short answer: identical twins come from one fertilized egg that splits, while fraternal twins come from two separate eggs. The longer answer includes genetics, development and common misconceptions.
Appearance and traits
Identical twins can still differ in fingerprints, personality and health outcomes because environment and life experiences matter.
Pregnancy implications
Twin type can influence medical follow-up and communication with care providers during pregnancy.
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