EM­BRYO AB­SORBS ITS TWIN

Sci­en­tists are not sure how un­born twins in the hu­man body orig­i­nate, but the er­ror prob­a­bly takes place when the egg di­vides into iden­ti­cal twins.

Science Illustrated - - ASK US -

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A fer­til­ized egg di­vides in two –a process, which nor­mally re­sults in iden­ti­cal twin em­bryos.

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But things can go wrong. In­stead of be­com­ing two sep­a­rate em­bryos, one ab­sorbs the other.

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The ab­sorbed egg ex­ists as a par­a­site in the other twin's body, de­vel­op­ing into an im­ma­ture, un­born twin.

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