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Well, there are two kinds of twins: identical twins (called monozygotic, or MZ) and fraternal twins (called dizygotic, or DZ).—Razib Khan, Discover Magazine, 6 May 2012 Twinning varies across populations and families, but that variance tends to be of the fraternal (dizygotic) variety.—Razib Khan, Discover Magazine, 24 Mar. 2011 Identical, or monozygotic (MZ), pairs have identical DNA, while dizygotic (DZ) twins are no more alike than any other brothers or sisters, genetically.—Neuroskeptic, Discover Magazine, 6 July 2011 The surges in twin births occurred only in fraternal twins, or dizygotic twins, where two eggs were separately fertilized.—Elizabeth Gamillo, Smithsonian Magazine, 16 Mar. 2021 The rate of fraternal (or dizygotic) twins tends to rise with the use of certain fertility assistance drugs.—Brian Clark Howard, National Geographic, 2 Sep. 2016
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