  It was recently shown by the authors that the Fritzsch ansatz for the quark
mass matrices prescribed at the supersymmetric grand unified scale is
compatible with a moderately heavy top quark ($m_t \simeq 120-150~GeV$). Here
we extend the ansatz to incorporate the charged leptons and the neutrinos. It
is found that the $\nu_e-\nu_\mu$ mixing angle is small and consistent with the
MSW solution of the solar neutrino puzzle. Furthermore, the model predicts
observable $\nu_\mu-\nu_\tau$ oscillations with sin$^22\theta_{\mu \tau} \simeq
0.1$ and $\nu_\tau$ mass in the $(1-3)~eV$ range.

High Energy Physics - Phenomenology