Author(s): Pushpalatha M1, Sharmadha K. L2, Meenakshi Parthasarthy3
ABSTRACT: A twin is one of the two offsprings produced in the same pregnancy. Twins can either be monozygotic (identical) meaning that they develop from one zygote that splits and forms two embryos, or develop from two eggs, each fertilized by separate sperm cells. Women who have family history of fraternal twins have a higher chance of producing fraternal twins themselves, as there is a genetically linked tendency to hyper-ovulate. There is no known genetic link for identical twinning. Conjoined twinning is a rare phenomenon, occurrence being 1 in 50000 to 100000. However since 60% are stillborn or die shortly after, the true incidence is around 1 in 200000 live births.