Your body does this itself. You have two copies of every chromosome and they’re practical identical. A break in one will be repaired by using the other chromoso

Your body does this itself. You have two copies of every chromosome and they’re practical identical. A break in one will be repaired by using the other chromosome. Similarly, even a base change in one strand of one chromosome will be repaired based off the other strand (with a chance that the wrong strand is chosen tho). DNA repair mechanisms like these are exploited by CRISPR and other gene modification strategies: break the part you want to change and then trick the repair mechanism into making the modification you want by providing it with an appropriate template to work off. (Not all CRISPR based techniques use this.)