Twin | Identical, Monozygotic, Dizygotic | Britannica
https://www.britannica.com/science/twin
WEBMar 2, 2024 · twin, either of two young who are simultaneously born from one mother. Twinning, common in many animals, is of two biological kinds: the one-egg (monozygotic), or identical, type and the two-egg (dizygotic), or fraternal, type. The latter type is more usual and can be thought of simply as a litter of two.
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