Which step in recombinant DNA technology ensures only transformed lls grow?
Selectable markers, such as antibiotic resistance genes, help distinguish transformed lls from non-transformed lls by allowing growth only in selective media.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Principles of Inheritance, Molecular Basis of Inheritance and Biotechnology, Topic: Genetics, DNA techniques and applications.