Question

What is a technique that involves putting a healthy copy of gene into cells that have a defective copy of the same gene.

Answer 1

gene therapy is the answer you are looking for

Answer 2

The correct answer would be gene therapy.

Gene therapy is a genetic engineering technique used for transplantation of normal gene in the genome of the cell in order to replace the missing or defective gene.

This therapy is used to treat genetic disorders such as cystic fibrosis, hemophilia, heart disease et cetera.