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Recently type II seesaw dominance in a supersymmetric SO(10) framework hasbeen found useful in explaining large solar and atmospheric mixing angles aswell as larger values of $theta_{13}$ while unifying quark and lepton masses.An important question in these models is whether there exists consistencybetween coupling unification and type II seesaw dominance. Scenarios where thisconsistency can be demonstrated have been given in a SUSY framework. In thispaper we give examples where type II dominance occurs in SO(10) models withoutsupersymmetry but with additional TeV scale particles and also in models withsplit-supersummetry. Grand unification is realized in a two-step process viabreaking of SO(10) to SU(5) and then to a TeV scale standard model supplementedby extra fields and an SU(5) Higgs multiplet ${15}_H$ at a scale about$10^{12}$ GeV to give type-II seesaw. The predictions for proton lifetime inthese models are in the range $\tau_p^0 = 2\times 10^{35}$ yrs. to $\tau_p^0 =6\times 10^{35}$ yrs.. A number of recent numerical fits to GUT-scale fermionmasses can be accommodated within this model.

Type II Seesaw Dominance in Non-supersymmetric and Split Susy SO(10) and Proton Life Time