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Why did Maynard-Smith's model of sex present a paradox for evolutionary biology?

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Why did Maynard-Smith's model of sex present a paradox for evolutionary biology? Why does his model not work in real life? 

Oct 20th, 2017

A logical argument highlighting this paradox could go something like:

  1. Sex allocation is even.
  2. The contribution of males to reproduction is negligible in comparison with females (referred to as the negligible-male-contribution assumption).
  3. A mutation for parthenogenesis and nothing else occurs (referred to as the all-else-equal assumption).
  4. Therefore, parthenogenesis should replace sexual reproduction quickly, even if it was doomed in the long term, because all offspring will contribute to population growth.
  • Observation: Sexual reproduction prevails in nature, and not only in long-term competition between taxa; sex is evolutionarily maintained in the short term as well.
http://quod.lib.umich.edu/p/ptb/6959004.0004.001/--paradox-of-sexual-reproduction-and-the-levels-of-selection?rgn=main;view=fulltext

Oct 31st, 2014

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