Under what circumstances can twins be born in humans?

Twins are born when two eggs are fertilized by separate sperms or the single zygote splits and forms two embryos.

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Atwinis one of twooffspringproduced in the samepregnancy.[1]Twins can either bemonozygotic("identical"), meaning that they develop from onezygotethat splits and forms twoembryos, ordizygotic("fraternal"), meaning that they develop from two eggs, each fertilized by separate sperm cells.[2]

In contrast, afetuswhich develops alone in the womb is called asingleton, and the general term for one offspring of amultiple birthismultiple.[3]

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