Abstract
Models are presented showing that, under certain conditions, when multiple offspring are reared simultaneously, the magnitude of offspring selfishness is independent of offspring-offspring genetic relatedness. When the cost (θ) of the selfish offspring's behavior approaches zero, alleles causing offspring selfishness spread as long as c b is positive. In general, simultaneous offspring are predicted to behave more selfishly than sequential offspring. Stable equilibria between alleles for selfish and non-selfish behavior are predicted for certain selfish alleles.
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