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Association of Handedness and Birth Order in Monozygotic Twins

Published online by Cambridge University Press:  01 August 2014

J.C. Christian ,
D.S. Hunter ,
M.M. Evans  and
F.M. Standeford
J.C. Christian*
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
D.S. Hunter
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
M.M. Evans
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
F.M. Standeford
Affiliation:
Department of Medical Genetics, Indiana University School of Medicine, Indianapolis
*
Department of Medical Genetics, 1100 West Michigan Street, Indianapolis, IN 46202, USA

Abstract

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In a random sample of 104 pairs of middle-class Caucasian, handedness-discordant twins six years of age or older, a significant relationship has been found between birth order and handedness in monozygotic twins, there being an excess of left-handed among first-born twins (P < 0.01). No such relation has been found in dizygotic twins.

Keywords

HandednessBirth orderMonozygotic twinsAsymmetry
Type
Brief-Report
Information
Acta geneticae medicae et gemellologiae: twin research , Volume 28 , Issue 1 , January 1979 , pp. 67 - 68
Copyright
Copyright © The International Society for Twin Studies 1979

References

REFERENCES

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