二に卵らん性せい

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

fraternal (twins); dizygotic

Medical term describing twins that develop from two separate fertilized eggs. Often used in the phrase 二卵性双生児 (fraternal twins).

See also: 一卵性

• 二に卵らん性せい双そう生せい児じは遺い伝でん的てきに通つう常じょうの兄きょう弟だいと同おなじくらい似にている。

  Fraternal twins are genetically as similar as ordinary siblings.