[Campbell Biology P.483] According to Figure 20.22, what is the initial step in gene therapy... | Practice Question

According to Figure 20.22, what is the initial step in gene therapy using a retroviral vector?

  • A: Injecting engineered cells into the patient.
  • B: Letting the virus infect bone marrow cells.
  • C: Inserting the RNA version of the normal allele into a retrovirus or other viral vector.
  • D: Viral DNA carrying the normal allele inserts into the chromosome.

Explanation

Figure 20.22 explicitly labels step 1 as 'Insert RNA version of normal allele into retrovirus or other viral vector,' which is the initial step in preparing the therapeutic vector.