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Normally, twins have two separate di- being a numerical prefix for two chorions and amniotic sacs , termed Dichorionic-Diamniotic or "DiDi". However, they fuse together and appears to be a single placenta. Archived from the original PDF on Monozygotic twins who share a placenta can develop twin-to-twin transfusion syndrome. Most conjoined twins are now evaluated for surgery to attempt to separate them into separate functional bodies. Another abnormality that can result in monozygotic twins of different sexes is if the egg is fertilized by a male sperm but during cell division only the X chromosome is duplicated.

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Archived from the original on 17 January

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Have you heard of these rare and unique twin types?

By using this site, you agree to the Terms of Use and Privacy Policy. In fact twins are either mono zygotic or dizygotic polyzygotic depending upon the fact that they have evolved from one zygote formed by fertilisation of one sperm and one ovum which later on undergo special mitotic division to form two zygotes or from fertilisation of two or more ova by two or more sperms. The children of monozygotic twins test genetically as half-siblings or full siblings, if a pair of monozygotic twins reproduces with another pair or with the same person , rather than first cousins. Unlike singleton gestation where identification of patients at risk for PTL is often difficult, every multiple gestation is at risk for PTL, so all patients can be managed as being at risk. Dichorionic-Diamniotic twins form when splitting takes place by the third day after fertilization. Certainly, we encourage them to pursue their individual interests, but the initial inclination towards these activities were all their own.

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