  The fundamental issue of the origin of mass for all quarks and leptons
(including Majorana neutrinos) is linked to dark matter, odd under an exactly
conserved Z(2) symmetry which may or may not be derivable from an U(1) gauge
symmetry. The observable sector interacts with a proposed dark sector which
consists of heavy neutral singlet Dirac fermions and suitably chosen new
scalars. Flavor symmetry is implemented in a renormalizable context with just
the one Higgs doublet of the standard model in such a way that all observed
fermions obtain their masses radiatively through dark matter.
