  We study technicolor models in which all of the technifermions are
color-singlets, focusing on the case in these fermions transform according to
the fundamental representation of the technicolor gauge group. Our analysis
includes a derivation of restrictions on the weak hypercharge assignments for
the technifermions and additional color-singlet, technisinglet fermions arising
from the necessity of avoiding stable bound states with exotic electric
charges. Precision electroweak constraints on these models are also discussed.
We determine some general properties of extended technicolor theories
containing these technicolor sectors.
