Final answer:
When DNA repair mechanisms fail following excessive UV exposure, it can lead to mutations that cause malignant melanoma, a serious form of skin cancer.
Step-by-step explanation:
The question revolves around the effects of ultraviolet (UV) radiation on DNA and potential outcomes when DNA repair mechanisms fail. If DNA does not successfully undergo repair after being damaged by UV exposure, the consequences can include various forms of skin damage
. One of the most severe consequences is the development of malignant melanoma, which is a type of skin cancer. This occurs because UV radiation can cause mutations in the DNA of skin cells, potentially leading to uncontrolled cell growth and tumor formation.