What is the transplantation of normal genes into cells to replace missing ones called?

• A. Gene Testing
• B. Stem Cell Research
• C. Aphasia Communication
• D. Gene Therapy

Answer: (D)

Gene therapy is the process of introducing normal genes into cells to replace missing or defective ones, with the goal of treating or preventing disease. This can be done by delivering a functioning gene into cells using a carrier, such as a harmless virus, or by editing the gene itself to fix mutations. When the correct gene is provided or corrected, the cell can produce the needed protein and restore normal function, which can slow or halt disease progression.

Gene testing, in contrast, is about identifying mutations to diagnose conditions, not replacing genes. Stem cell research focuses on studying or using stem cells for development or therapy, not specifically delivering new genes. Aphasia communication concerns a language impairment and its treatment, not genetic replacement.