  We consider the see-saw mechanism within a non-supersymmetric SO(10) model.
By assuming the SO(10) quark-lepton symmetry, and after imposing suitable
conditions that ensure that the right-handed (RH) neutrino masses are at most
mildly hierarchical (compact RH spectrum) we obtain a surprisingly predictive
scenario. The absolute neutrino mass scale, the Dirac and the two Majorana
phases of the neutrino mixing matrix remain determined in terms of the set of
already measured low energy observables, modulo a discrete ambiguity in the
signs of two neutrino mixing angles and of the Dirac phase. The RH neutrinos
mass spectrum is also predicted, as well as the size and sign of the
leptogenesis CP asymmetries. We compute the cosmological baryon asymmetry
generated through leptogenesis and obtain the correct sign and a size
compatible with observations.
