Abstract
The conventional SU(2){sub {ital L}}{times}SU(2){sub {ital R}}{times}U(1) electroweak gauge model is extended to include two heavy singlet quarks and one heavy singlet lepton. The scalar sector consists of two (2,1,1/2) doublets, two (1,2,1/2) doublets, one (2,1,3/2) doublet, one (1,2,3/2) doublet, as well as one (1,3,1) triplet. Realistic radiative masses for all light quarks and leptons are obtained. A {ital Z}{sub 2} discrete symmetry serves to distinguish the electron (or muon) and its neutrino from the other leptons.
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