Genetics
What Is CRISPR? The Gene-Editing Tool Borrowed From Bacteria
CRISPR-Cas9 lets scientists cut DNA at chosen spots using a guide RNA and a Cas9 enzyme, adapted from a bacterial defense system. Health agencies describe its first approved therapy and the debate over editing eggs, sperm and embryos.
What Is DNA? The Molecule That Carries Your Instructions
DNA is the molecule that carries genetic information. A short guide to its structure and how its letters pair.
What Is a Genome, and What Was the Human Genome Project?
A genome is an organism's complete set of DNA instructions. What that means and how large the human genome is.