Gene therapy is an attempt to correct a genetic defect by providing a normal gene into the individual. By this the normal function can be restored. An alternate method would be to provide the gene product (protein/enzyme) known as enzyme replacement therapy, which would also restore the function. Which in your opinion is a better option ? Give reason for your answer.

Repeated transfusions of genetically modified cells are required in $SCID$ patients and in enzyme replacement therapy because

What is the difference between the two mice as shown as in the figure?

Biotechnology is the modern branch of biology which deals with

Select the correct statement $(s)$

$(1)$  $IARI$ has released a mustard variety rich in vitamin $C$.

$(2)$ Pusa Sawani variety of Okra is resistant to aphids.

$(3)$ Hairiness of leaves provides resistance to insect pests.

$(4)$ Agriculture accounts for approximately $33\%$ of India's $GDP$ and employs nearly $62\%$ of the population.