One of the applications of biotechnology is 'gene therapy" to treat a person born with a hereditary disease.
(i) What does "gene therapy " mean ?

Explanation

(i) Gene therapy is a corrective therapy to cure a person suffering form gentic disease. This process involves the transfer of a normal gene into a person.s cells that carries one or more mutant alleles Expression of normal gene is the person results in a functional gene product whose action produces a normal phenotype. Delivery of the normal gene is accomplished by using a vector.