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O(10) grand unification models which do not necessarily have an extra globalsymmetry are discussed, taking the model with one 10-plet in the Yukawa sectoras an example. A strong correlation between mass ratios and CP is found. Themass relation $m_t/m_b=v_u/v_d$ is recovered when $G_W=0$; and another specialrelation $m_t/m_b=G_E/G_W$ appears when $v_d=0$, where $G_{E,W}$ are Yukawacoupling constants and $v_{u,d}$ are VEVs. To facilitate this discussion, a setof $O(10)$ $\gamma$- matrices is offered based on a physical representation ofthe spinors and that of the vector of the $SO(10)$ group. Flavor changingneutral currents in such models are also discussed.Comment: 17 pages, Latex fil

CP SYMMETRY AND FERMION MASSES IN O(10) GRAND UNIFICATION MODELS