Final answer:
The best advantage of using the information gained from mapping out the genes in a human's body is gene therapy to correct defective genes that cause diseases.
Step-by-step explanation:
The best advantage of using the information gained from mapping out the genes in a human's body is gene therapy to correct defective genes that cause diseases. Gene therapy involves introducing functional genes into a person's cells to replace or correct the faulty genes that cause the disease. With knowledge of the human genome, scientists can identify and target specific genes to develop effective gene therapies.