from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Derived from two separately fertilized eggs. Used especially of fraternal twins.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Derived from two eggs that have been separately fertilized; dizygous

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. derived from two separately fertilized eggs


from Wiktionary, Creative Commons Attribution/Share-Alike License

di- +‎ zygotic


  • The mother assumed that she had given birth to fraternal twins (dizygotic, from two eggs) and not "identical" ones (monozygotic, two embryos developed from a single fertilized egg).

    Separated At Birth. Really.

  • In contrast, we present here evidence for cognitive “specialist genes”: monozygotic twins are more similar than dizygotic twins in the specific cognitive ability of face perception.

    Is Facial Recognition A Non-g Factor Mental Module?

  • Each of three measures of face-specific processing was heritable, i.e., more correlated in monozygotic than dizygotic twins: face-specific recognition ability, the face-inversion effect [2], and the composite-face effect [3].

    Is Facial Recognition A Non-g Factor Mental Module?

  • One thousand and seventy three pairs of adult monozygotic (MZ) twins and 895 pairs of same sex adult dizygotic (DZ) twins from the United Kingdom (UK) completed the Humor Styles Questionnaire: a 32-item measure which assesses two positive and two negative styles of humor.

    Humor and Dreaming

  • In this article, we report the results of two independently conceived and executed studies of monozygotic and dizygotic twins, one in Sweden and one in the United States.

    Archive 2008-03-01

  • A study published in the current issue of Journal of Personality studied adult male monozygotic (MZ) and dizygotic (DZ) twins to find that difference in religiousness are influenced by both genes and environment.

    Genetics and the Future of Religion, Bryan Caplan | EconLog | Library of Economics and Liberty

  • In most twin studies, the twins themselves (or their parents) report "twin type" - i.e., whether the twins are identical (monozygotic/MZ) or fraternal (dizygotic/DZ).

    EconLog: Economic Methods Archives

  • Twin studies make the following assumptions: Monozygotic, (identical), twins share all their genes and their environment but dizygotic, (fraternal), twins share half their genes and their environment.


  • December 20th, 2006 at 8: 32 am dizygotic* michelle Says:

    Peers Into The Lives Of Two Headed Twins

  • Recent findings have shown, that variation in total gray and white matter volume of the adult human brain is primarily (70-90%) genetically determined [Baare et al, 2001] and in a recent magnetic resonance imaging (MRI) brain study with 45 monozygotic and 61 dizygotic 9-year-old twin-pairs, and their 87 full siblings also high heritabilities have been found [Peper et al, in preparation].

    Brains, Genes, Nature and Nurture


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