An example of gene therapy is
(a) production of injectable hepatitis B vaccine.
(b) production of vaccines in food crops like potatoes which can be eaten.
(c) introduction of gene for adenosine deaminase in persons suffering from Severe Combined Immuno Deficiency (SCID).
(d) production of test-tube babies by artificial insemination and implantation of fertilized eggs.
(c) introduction of gene for adenosine deaminase in persons suffering from Severe Combined Immuno Deficiency (SCID).
Explanation:
Gene therapy is a new system of medicine. Excellent example of gene therapy is SCID. They have defective gene for the enzyme adenosine deaminase (ADA). They lack Tlymphocytes which fail to combat the infecting pathogen. Lymphocytes are extracted from the patients bone marrow and normal functioning copy of gene coding for ADA is introduced into these lymphocytes with the help of retrovirus. The cells so treated are reintroduced into patients bone marrow which reactivate patients immune system for life.