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Related Experiment Videos

[Laterality in twins]

M Reiss1

  • 1Klinik für Hals-Nasen-Ohrenheilkunde, Universitätsklinikum der Technischen Universität Dresden.

Zeitschrift Fur Morphologie Und Anthropologie
|September 1, 1996
PubMed
Summary
This summary is machine-generated.

Twin studies reveal low concordance for asymmetries in both monozygotic (MZ) and dizygotic (DZ) twins. Left-handedness is higher in twins than singletons, but not explained by mirror imaging.

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Area of Science:

  • Human genetics
  • Developmental biology
  • Twin research

Background:

  • Laterality, or the preferential use of one side of the body, is a complex trait.
  • Twin studies are crucial for disentangling genetic and environmental influences on human development.
  • Existing literature suggests low concordance for asymmetries even in genetically identical twins.

Purpose of the Study:

  • To review the literature on twinning and laterality.
  • To examine genetic models for the inheritance of asymmetries.
  • To investigate the causes of increased left-handedness in twins.

Main Methods:

  • Literature review of studies on monozygotic (MZ) and dizygotic (DZ) twins.
  • Analysis of concordance rates for functional and morphological asymmetries.

Related Experiment Videos

  • Examination of incidence rates of left-handedness in twins versus singletons.

    • Main Results:

    • Both MZ and DZ twins exhibit low concordance for functional and morphological asymmetries.
    • The distribution of handedness (R-R, R-L, L-L) follows a binomial pattern in both MZ and DZ twins.
    • Left-handedness is more common in twins than singletons, but this is not linked to "mirror imaging".

    Conclusions:

    • No simple genetic model explains the inheritance of laterality in twins.
    • Pathological factors associated with twinning, such as intrauterine crowding and perinatal stress, may contribute to higher left-handedness rates.
    • Laterality in twins is a complex trait influenced by factors beyond simple genetics.