There's two general pathways for repair of a double stranded break. You should look into both and this will answer your question. The first is non homologous end joining (generally this leads to the introduction of indels), and the second is homology directed repair (which is the mechanism used to insert new segments of DNA near a double stranded break).
bioprog t1_iy01b2i wrote
Reply to How exactly does CRISPR-CAS9 insert new genes? by AutomaticAd1918
There's two general pathways for repair of a double stranded break. You should look into both and this will answer your question. The first is non homologous end joining (generally this leads to the introduction of indels), and the second is homology directed repair (which is the mechanism used to insert new segments of DNA near a double stranded break).