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Sex ratio of offspring of male mountaineers
  1. W H James
  1. Correspondence to Dr W H James, The Galton Laboratory, Department of Genetics, Evolution and Environment, University College London, Wolfson House, 4 Stephenson Way, London NW1 2HE, UK; whjames{at}waitrose.com

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Saadat and Khalili1 cited evidence that men’s testosterone concentrations reportedly decline (temporarily) when they pay short visits to extreme altitudes.2 Moreover, these authors cited my hypothesis3 that the sex ratio (proportion male) of the offspring is partially dependent on parental hormones around the time of conception, low levels of testosterone (in either parent) being associated with the subsequent births of daughters. So these …

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