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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 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