Today On (May 15, 2023) in the presence of the head of departments and lecturer a symposium entitled (DNA Damage and Repair), was presented by (Assist Prof. Dr. Mohammed Khidhir) from the medical laboratory department, where it has been explained about TFactors that damage the DNA and the type of repair systems. 4 different repair systems responsible for repairing DNA damage incurred by physical agents. Explain the role of the SOS repair system. If DNA repair system fail to repair the damage its lead to mutation or even cancer, At the end of the symposium, a set of questions and answers were raised on this subject