一いち卵らん性せい

noun which may take the genitive case particle 'no', noun

identical (twins); monozygotic

Medical term used to describe twins from a single fertilized egg. Often used in the phrase 一卵性双生児 (identical twins).

See also: 二卵性

• 彼かれらは一いち卵らん性せいの双ふた子ごです。

  They are identical twins.

• 一いち卵らん性せい双そう生せい児じは遺い伝でん的てきに同どう一いつです。

  Monozygotic twins are genetically identical.