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Conjoined twins are identical twins  joined in utero. An extremely rare phenomenon, the occurrence is estimated to range sex with siamese twin
1 in 49, births to 1 inbirths, with a somewhat higher incidence in Southwest Asia and Africa. Most live births are female, with a ratio of 3: Two contradicting theories exist to explain the origins of conjoined twins. The more generally accepted theory is fissionin which the fertilized egg splits partially. Conjoined twins share a single common chorionplacentaand amniotic sacalthough these characteristics are not exclusive to conjoined twins, as there are some monozygotic but non-conjoined twins who also share these structures in utero. The most famous pair of conjoined twins was Chang and Eng Sex with siamese twin