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I'm not at a biologist, but I have a pet theory I'd like to throw into the ring: hermaphroditism tends to be unstable in a similar way to strong sex skews. Imagine species A where 90% of offspring are female; at moderate population density, the 10% male population will be more than sufficient to maintain the females, and having 90% of the population able to ...


Richard Dawkins dedicated a part of his magnificent The Selfish Gene to explain the evolution of macro- and micro-gametes. It's worth the read.

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