Variational propensities: development and ultimate causes

This paper applies philosophical tools from the causalists/statisticalists debate to the evo-devo idea of variational tendencies as propensities biasing phenotypic change. It contends that variational properties are present in a statistical sense in some population dynamics models, particularly quantitative genetics ones, providing ultimate variational explanations. It further argues that these properties, contrary to some recent views, cannot be subsumed under natural selection. Finally, it advocates for a causalist interpretation of these explanations, where variational statistical properties indirectly refer to evo-devo’s variational propensities.