  We consider the neutrino mixing angles in an SO(10) GUT with the usual Higgs
structure in which neutrino masses are explained by the type-I see-saw
mechanism. The Dirac-neutrino Yukawa matrix then has a structure similar to
that of the $u$-quark. We determine the light neutrino mass matrix through
type-I see-saw mechanism using the experimentally consistent $u$-quark Yukawa
matrix. We find that large neutrino mixing-angles emerge naturally in this
model.
