  We explain the imbalance of the flavor mixing angles between the quark and
the lepton sectors in the context of the SU(5) GUT with the see-saw mechanism.
The quark masses and the CKM matrix elements are obtained by using,
respectively, the Fritzsch and Branco - Silva-Marcos form for the up- and
down-quark Yukawa matrices (y^u and y^d) at the GUT scale. The charged-lepton
Yukawa matrix (y^e) is the transpose of y^d, modified by the Georgi-Jarlskog
factor. We show that the neutrino masses and mixing angles suggested by the
recent solar and atmospheric neutrinos are then obtained from a simple texture
of the neutrino Yukawa matrix (y^\nu) and a diagonal right-handed Majorana mass
matrix at the GUT scale.
