  We study dynamical flavor symmetry breaking in the context of a class of N=1
supersymmetric SU(n_c) and USp(2 n_c) gauge theories, constructed from the
exactly solvable N=2 theories by perturbing them with small adjoint and generic
bare hypermultiplet (quark) masses. We find that the flavor U(n_{f}) symmetry
in SU(n_{c}) theories is dynamically broken to $U(r)\times U(n_{f}-r)$ groups
for $n_f \leq n_c$. In the r=1 case the dynamical symmetry breaking is caused
by the condensation of monopoles in the $\underline{n_{f}}$ representation. For
general r, however, the monopoles in the $\underline{{}_{n_{f}}C_{r}}$
representation, whose condensation could explain the flavor symmetry breaking
but would produce too-many Nambu--Goldstone multiplets, actually ``break up''
into ``magnetic quarks'' which condense and induce confinement and the symmetry
breaking. In USp(2n_c) theories with $n_f \leq n_c + 1$, the flavor SO(2n_f)
symmetry is dynamically broken to U(n_f), but with no description in terms of a
weakly coupled local field theory. In both SU(n_c) and USp(2 n_c) theories,
with larger numbers of quark flavors, besides the vacua with these properties,
there exist also vacua with no flavor symmetry breaking.
