logy 128: II- 45. 31. OFT [IA 1000) A minimum on the mean number of steps taken in adaptive walks. Journal of Theoretical Slalom. 220: 241 247. 31 Wentreich DM, Watson R.A. IThaci I. (2005) Penpective:sign epistasit and genetic constraint on evolutionary trajectories. Evolution 59: 1165 1174. 33. Poelwi