Before revision: Monoamniotic twins are always monozygotic (identical twins).Pregnancy-Info -- > Monoamniotic Twins Retrieved on July 9, 2009 Monochorionic-Diamniotic twins are almost always monozygotic, with a few exceptions where the blastocysts have fused .
After revision: Monoamniotic twins are always monozygotic (identical twins).Pregnancy-Info -- > Monoamniotic Twins Retrieved on July 9, 2009 Monochorionic-Diamniotic twins are always monozygotic .