Genetic mechanisms : It is widely believed that monozygotic twins are genetically identical and any differences among them are result of environmental influence . But there is an ever-growing body of evidence that monozygotic twins are not always genetically identical . A number of phenotypic variations in monozygotic twins have been demonstrated to be caused by genetic differences alone and not influence by ante-natal environmental factors . In addition epigenetic modifications in particular sets of gene within a monozygotic twin pair leads to altered...











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