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Sex ratio at birth and latitude
  1. WILLIAM H JAMES
  1. The Galton Laboratory
  2. University College London
  3. Wolfson House, 4 Stephenson Way
  4. London NW1 2HE, UK

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    Editor,—Grech et al 1 report that sex ratio (proportion male) at birth declines highly significantly with increase in geographical latitude in Europe. They wonder if this is an effect of temperature variation. This may be so, but I suggest that variations in maternal hormone levels are a proximate cause. The reason for suggesting this is as follows. …

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