oh Wikipedia

[gusl]

Wikipedia's article on balancing selection fails to mention the obvious example of gender in mammals! Any population-wide propensity to produce more of one gender (assuming childhood mortality doesn't preferentially affect one gender) implies reduced fitness for most fathers^*, and a Darwinian "incentive" to produce more of the other gender. But I would be afraid of this example being deleted because I don't have any sources, since it's just common sense... and [[Wikipedia isn't CommonSensePedia!]].


^{* - I say "fathers" because it is the sperm that are responsible for the child's gender.}