  The existence of new quarks may lead to their mixing with ordinary quarks. We
are particularly interested in studying the consequences such mixings could
have upon the electromagnetic current. We find that new strong flavor and
parity violating electromagnetic interactions may exist. To be specific, for
our analysis we work with the model: $SU_2 \otimes U_1 \otimes \hat{SU}_2
\otimes \hat{U}_1$, which doubles the standard electroweak sector, both in
gauge bosons and in quarks.
