CRISPR is a technology that enables scientists to edit DNA by removing, adding or changing part of a DNA sequence.
It is currently the simplest and most precise method of genetic manipulation.
How does it work?
CRISPR-Cas9 editing uses a protein that can cut DNA (so pieces of DNA can be added or removed) and a guide RNA that identifies where to cut.
So, the Cas9 follows the guide RNA to a specific location in the DNA sequence and then makes a cut across both strands of the DNA.
The cell recognizes that the DNA is damaged and tries to repair it.
Here’s a TED talk describing how it works.