Final answer:
Gene therapy has had some success in treating single-gene disorders by inserting normal genes to replace defective ones using viral vectors, but it remains an experimental technique with many challenges yet to be addressed.
Step-by-step explanation:
Gene therapy presents a promising approach to curing a variety of genetic disorders by inserting normal genes into cells that carry mutant genes. This technique has shown some success, particularly in diseases caused by single-gene defects such as cystic fibrosis, hemophilia, muscular dystrophy, and sickle cell anemia.
In this process, a correct version of the gene is delivered into human cells using a viral vector, often an adenovirus. Despite the potential, gene therapy remains largely experimental, with a few notable successes but still faces significant challenges and risks that need to be overcome before it can become a common treatment.