Final answer:
Tissue Plasminogen Activator (tPA) is the genetically engineered medical product used to treat a stroke caused by a blood clot.
Step-by-step explanation:
The genetically engineered medical product used to treat a stroke caused by a blood clot is Tissue Plasminogen Activator (tPA). Tissue Plasminogen Activator is an enzyme that catalyzes the conversion of plasminogen to plasmin, the primary enzyme that breaks down clots. It is administered to patients within 3 hours following a thrombotic stroke to improve the prognosis significantly.