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Twins are two children produced by the same pregnancy. They can either be monozygotic meaning identical or dizygotic meaning fraternal.

When a set of twins are of separate sexes, they are by definition dizygotic twins, as they are no more related than any other sibling.

Monozygotic twins are the result of a fertilized embryo splitting itself into two identical specimens. As such, Fred and George Weasley were monozygotic twins, as their identical appearance was often capable of fooling their own mother.

Known twins

Notes and references

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