  The leading weak corrections to the production of top quark pairs via
$q\bar{q} \to t\bar{t}$ in $p\bar{p}$ collisions are evaluated. The
chromo-anapole form factor of the top quark and effects of parity violation are
studied in the Standard Model (SM) and the Minimal Supersymmetric Model (MSSM).
The parity violation effect in $q\bar{q} \to g \to t\bar{t}$ from the SM weak
corrections is found to be very small. In the MSSM, the effects of parity
violation can be enhanced for $\tan\beta \equiv v_2/v_1 > \sqrt{m_t/m_b}$.
