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Sex ratio: a biological perspective of 'Sex and the City'.

Authors
  • Pergament, Eugene
  • Toydemir, Pinar Bayrak
  • Todydemir, Pinar Bayrak
  • Fiddler, Morris
Type
Published Article
Journal
Reproductive BioMedicine Online
Publisher
Elsevier
Publication Date
Jan 01, 2002
Volume
5
Issue
1
Pages
43–46
Identifiers
PMID: 12470545
Source
Medline
License
Unknown

Abstract

The primary sex ratio in humans differs remarkably from the theoretically expected equality of 1:1, and may be as high as 170 males to 100 females. A number of environmental, physiological and genetic factors have been observed to impact on the primary sex ratio: sexual behaviour, variation in hormonal concentrations, natural disasters, environmental pollutants and timing of conception. Nevertheless, no biological mechanism or interaction of factors has suitably explained this phenomenon, or that of the prenatal vulnerability of the male, the suspected higher sex ratio in spontaneous abortion and the male excesses in adult diseases related to the intrauterine environment. Knowledge of the environmental effects and causes of natural variation in the primary sex ratio will make possible its manipulation, which will have public health implications as well as cultural and social consequences.

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