What happen to evolving biosystems when all phenotypes perform approximately equally well? Weak selection is an important limiting case in evolutionary biology and it occurs when a phenotype is slightly advantageous over another. Traulsen and co-workers investigate the influence of weak selection on the stochastic dynamics in finite populations both unstructured and structured populations.
Wu B, Altrock PM, Wang L, Traulsen A.
Universality of weak selection.
Phys Rev E Stat Nonlin Soft Matter Phys. 2010 Oct;82