PMID: 6103451May 24, 1980Paper

Time of fertilisation and sex of infants

Lancet
W H James

Abstract

The sex of a human zygote may depend on the time during the mother's menstrual cycle that it is formed. Direct data to support this hypothesis suggest that male zygotes tend to be formed both early and late in the fertile period, and female zygotes in the middle. Criticisms of the direct data seem to be only that measurements of the timing of events around conception are inexact. There are several kinds of indirect data: (1) the variation of sex ratio with war and with duration of marriage, and (2) the non-binomial distribution of the combination of the sexes in human dizygotic twins and other mammalian polyzygotic litters. The sex of a zygote may be determined by maternal gonadotrophin levels when it is formed. This elaboration of the hypothesis could explain the low sex ratio in Negroes.

References

Nov 15, 1979·The New England Journal of Medicine·W H James
Dec 1, 1976·Genetical Research·W H James
Mar 20, 1975·The New England Journal of Medicine
Jan 1, 1975·Annals of Human Genetics·W H James
Jul 1, 1972·Journal of Biosocial Science·W H James
Jan 1, 1970·Annals of Human Genetics·K O Renkonen
Jan 1, 1957·Cold Spring Harbor Symposia on Quantitative Biology·B COLOMBO
Nov 1, 1958·Annals of Human Genetics·A W EDWARDS
Jun 25, 1960·Nature·A W EDWARDS
Jan 1, 1964·Acta Genetica Et Statistica Medica·K O RENKONEN

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Citations

Jan 1, 1991·Psychoneuroendocrinology·P Tallal
Jul 26, 1980·Lancet·P J Green
Jul 26, 1980·Lancet·A Czeizel
Oct 1, 1981·Journal of Biosocial Science·W H James
Oct 1, 1982·Journal of Biosocial Science·W H James
Jan 1, 1984·Journal of Biosocial Science·W H James
Jan 1, 1985·Journal of Biosocial Science·W H James, J Rostron
Apr 1, 1990·Journal of Biosocial Science·B BønnelykkeJ Nielsen
Mar 19, 2011·Skinmed·Naili MaW Clark Lambert
Sep 13, 1980·British Medical Journal·W H James
Aug 1, 1985·Journal of Medical Genetics·W H James
Feb 18, 2010·Twin Research and Human Genetics : the Official Journal of the International Society for Twin Studies·Johan Fellman, Aldur W Eriksson
Oct 28, 2008·Journal of Postgraduate Medicine·S Garg, A Nath
Sep 1, 1985·British Journal of Obstetrics and Gynaecology
Feb 1, 1982·British Journal of Obstetrics and Gynaecology·D Mortimer, D W Richardson
Feb 13, 1982·British Medical Journal·W H James
Apr 26, 2015·Journal of the Chinese Medical Association : JCMA·Victor Grech
Jan 1, 1984·Annals of Human Biology·W H James
Dec 2, 1982·Nature·M J Simpson, A E Simpson
Jan 1, 1991·Acta geneticae medicae et gemellologiae·R PicardE Picard
Mar 1, 1985·British Journal of Obstetrics and Gynaecology·W H James
Jan 1, 1984·Annals of Human Biology·W H James
Dec 22, 1999·Human Reproduction·P Astolfi, L A Zonta
Jan 1, 1996·American Journal of Primatology·S WatsonD Stafford
Sep 1, 1985·Annals of Human Biology·W H James
Dec 22, 1999·Human Reproduction·R JacobsenA Mouritsen
Jun 7, 1985·Journal of Theoretical Biology·W H James

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