1) Enzygotic 2) Identical 3) Monozygous 
Monozygous ... Synonym: unigerminal. ... See: monozygotic twins. ... Origin: mono-+ G. Zygotos, yoked ... (05 Mar 2000) ... 
(mon″o-zi-got´ik) pertaining to or derived from a single zygote, such as monozygotic twins. See also dizygotic.
Means single. In monozygotic twins one fertilised egg separates into two identical zygotes.
Type: Term Pronunciation: mon′ō-zī-got′ik, -zī′gŭs Synonyms: unigerminal See: monozygotic twins, under twin
[adj] - derived from a single fertilized egg
monozygotic, monozygosity, monozygous Pertaining to or derived from one zygote.
adjective derived from a single fertilized egg; `monozygotic twins`
developed from a single fertilized ovum, as identical twins.