lection (e.g. see section 4.2 in Nagylaki, 1992). The difference is that, barring atypical phenomena such as meiotic drive (Dunn, 1953; Sandler and Novitsky, 1957) or segregation- distortion (Sandler and Hiraizumi, 1960; Hard. 1974), standard diploid models always have b(n) = c(n). It is by allowing b(n)