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The Sex Ratios of Monozygotic and Dizygotic Twins

Published online by Cambridge University Press:  21 February 2012

William H. James*
Affiliation:
The Galton Laboratory, Department of Genetics, Evolution and Environment, University College London, United Kingdom. [email protected]
*
*Address for correspondence: William H James, The Galton Laboratory, Department of Genetics, Evolution and Environment, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, England.

Abstract

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Fellman and Eriksson (2010) cited my suggestion that the sex ratio (proportion male) of monozygotic (MZ) twins is lower than that of dizygotic (DZ) twins (James 1975). Here I offer elaborations on and potential explanations for this.

Type
Articles
Copyright
Copyright © Cambridge University Press 2010