Question

how could gene therapy be used to treat diseases caused by mutated genes?
a. it could change genes in an individual so that offspring cannot get the disease
b. it could change a few bases in a piece of mutated dna in only one cell
c. it could infect a person with a virus that is more harmful than the mutation
d. it could deliver a corrected version of a gene to a persons cells
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Explanation:

Gene therapy aims to treat diseases caused by mutated genes by introducing a functional (corrected) version of the gene into the patient's cells. Option A is incorrect as gene therapy typically targets somatic cells, and changes aren't passed to offspring. Option B is more related to gene editing techniques like CRISPR for single - base changes, not the main mechanism of gene therapy. Option C describes a risk of gene therapy (using viral vectors) but not its therapeutic use. Option D correctly states that gene therapy can deliver a corrected gene version to a person's cells to replace or supplement the mutated gene, thus treating the disease.

Answer:

D. It could deliver a corrected version of a gene to a person’s cells.