  The Extended Supersymmetric Standard Model (ESSM), motivated on several
grounds, introduces two vector-like families [16+ 16-bar of SO(10)] with masses
of order one TeV. In an earlier work, a successful pattern for fermion masses
and mixings (to be called pattern I) has been proposed within a unified
SO(10)-framework, based on MSSM, which makes seven predictions, in good accord
with observations, including V_{cb} ~ 0.04, and \sin^22\theta_{\nu_\mu\nu_\tau}
\~ 1. To exibit new phenomenological possibilities which may arise within ESSM,
we present here a variant pattern (to be called pattern II) for fermion masses
and mixings, within the SO(10)/ESSM framework, which possesses the same degree
of success as pattern I as regards the masses and mixings of all fermions
including neutrinos. The main point of this paper is to first note that either
one of these two patterns, embedded in ESSM, would lead to a reduction in the
LEP neutrino-counting from N_\nu = 3 (in good agreement with the data) and also
provide a simple explanation of the (g-2)_\mu-anomaly, as pointed out in the
accompanying paper. They can, however, be distinguished from each other by (a)
a sharpening of our understanding of the true magnitude of the anomaly in
\nu_\mu-nucleon scattering, recently reported by the NuTeV group, (b) improved
measurements of m_t, m_H and m_W, (c) improved tests of e-\mu
lepton-universality in charged current processes, and (d) improvements in the
measurements of V_{ud} and V_{us}. Pattern II (extended to ESSM) would predict
departures from the standard model in the right direction with regard to (a)
and (b), though not as regards (c) and (d) while Pattern I practically would
coincide with the standard model as regards its predictions for all four
features: (a)-(d).
