Question

In genetic engineering, the antibiotic resistance genes are used

• A. as selectable markers
• B. to select healthy vectors
• C. as sequences from where replication starts
• D. to keep the cultures free of infection

Answer 1

The correct option is A as selectable markers

Selectable markers are often antibiotic resistance genes; bacteria that have been subjected to a procedure to introduce foreign DNA are grown on a medium containing an antibiotic, and those bacterial colonies that can grow have successfully taken up and expressed the introduced genetic material.