Give me a simple example of gene therapy!

Gene therapy is the fairly new method of disease treatment aimed mostly at genetic diseases. Basically, a normal allele is inserted into a patient's defective cells. This is a very new approach and most gene therapy is aimed at cancer treatment and hereditary genetic diseases, such as sickle cell anemia, cystic fibrosis, and muscular dystrophy.

Explanation:

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hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

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the correct answer is b