(a)[2]
State how genetic screening could lower the number of cases of haemophilia.
(b(i))[2]
Outline the objectives of gene therapy.
(b(ii))[1]
Suggest why haemophilia A is suitable for treatment using gene therapy.
(c(i))[2]
With reference to Table 4.1, suggest why gene therapy using the $F9$ gene has been more successful than gene therapy using the $F8$ gene.
(c(ii))[3]
Table 4.2 compares two vectors commonly used in gene therapy. With reference to Table 4.2, explain the advantages and disadvantages of choosing adenovirus instead of retrovirus as a vector.