Further evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels around the time of conception

doi:10.1093/humrep/deh245

Hum. Reprod. Advance Access published online on April 22, 2004
Human Reproduction, doi:10.1093/humrep/deh245
© 2004 by European Society of Human Reproduction and Embryology

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Received October 8, 2003
Accepted March 15, 2004

Opinion

Further evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels around the time of conception

William H. James ¹

¹ The Galton Laboratory, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, UK

Abstract

The present note is an attempt to supplement previous argumenton the hypothesized parental hormonal antecedents of mammalianoffspring sex ratios. It is intended that a reader who has readboth this paper and my previous paper should be aware of allthe data relating to the hypothesis [James WH (1996), J TheorBiol 180, 271-286].

Key words: Key words: estrogen/sex ratios/testosterone

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