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Siberian pros and cons of the SPrOO hypothesis
  1. V N Melnikov
  1. Siberian Independent Institute, P O Box 175, Novosibirsk, 630060, Russia;

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    I thank Dr Jongbloet for thoughtful response to our article. According to the SPrOO hypothesis, human females have a fundamental seasonal variation in ovulatory pattern, one of several factors explaining differences in sex ratio (SR). The hypothesis presumes inherent ovulatory and anovulatory seasons and suggests that secondary SR varies over the year from the femininity, or an approach to gender equality, coinciding with the zenith of birth frequency, to the excess of male births concentrating at the beginning and the end of this optimum. The question is what are these seasons in Siberia?

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