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We show that the observed pattern of quark flavor mixing, such as |V_{us}|\simeq |V_{cd}|, |V_{cb}| \simeq |V_{ts}|, |V_{cd}/V_{td}| \simeq|V_{cs}/V_{ts}| \simeq |V_{tb}/V_{cb}| and |V_{ub}/V_{cb}| < |V_{td}/V_{ts}|,can essentially be understood in the chiral and heavy quark mass limits. Inparticular, the phenomenologically successful relations |V_{ub}/V_{cb}| \sim\sqrt{m_u/m_c} and |V_{td}/V_{ts}| \simeq \sqrt{m_d/m_s} can be reasonablyconjectured in the m_b \to \infty and m_t \to \infty limits, respectively. Westress that the strength of weak CP violation in the quark sector is determinedby the moduli of the four corner elements of the Cabibbo-Kobayashi-Maskawamatrix. A comparison between strong and weak CP-violating effects in thestandard model is also made.

Model-independent access to the structure of quark flavor mixing