Participates in the inductive signaling pathway downstream of let-60 Ras and the RAF/MAP kinase cascade to regulate specification and differentiation of many cell types. Positively regulates the fate of vulval precursor cells. Required for induction of the P12 and excretory duct cell fates. In males, it is also required for proper formation of spicules. Does not function in the signaling pathway that promotes exit from pachytene (By similarity).