From Simple English Wikipedia, the free encyclopedia
A telomere is a region of DNA at the end of a chromosome. It protects the end of the chromosome from deteriorating (getting worse) or fusing (joining) with other chromosomes.
The telomeres are made of repeated sequences of DNA ('repetitive DNA'). During cell division, enzymes that duplicate DNA cannot continue their work all the way to the end of chromosomes. If cells divided without telomeres, they would lose the ends of their chromosomes, and the information they contain.