Identical twins, scientifically known as "Monozygotic Twins", are twins who share 100% of their DNA, having nearly identical or completely identical physical traits.
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Identical twins are the result of one egg cell being fertilized by one sperm cell, after which it successfully implanted in the womb before undergoing cell division and separating completely into two embryos.
Both siblings share 100% of their DNA as a result. This means the resulting siblings are essentially two copies of the same person. They are always the same gender, and outside of hairstyle, they look extremely similar visually. Physical differences between them form much later in development, such as minor differences between their fingerprints.

During development, both embryos share the same placenta and amniotic sac.

See also

• twins (lore): Tag for characters that are twins, regardless of how much DNA they share.
• fraternal twins: Tag for characters that share 50% of their DNA.
• half-identical twins: Tag for characters that share 75% of their DNA.
• Monozygotic (identical) twins: Information about Monozygotic twins.