What do telomeres prevent in chromosomes?

Telomeres are the protective caps located at the ends of chromosomes, composed of repetitive nucleotide sequences, and their primary function is to prevent the deterioration of chromosomes. As cells divide, the telomeres shorten, which eventually limits the number of divisions that can occur. This shortening is a crucial aspect of cellular aging and plays a role in maintaining genomic integrity.

By preventing the end degradation of chromosomes, telomeres ensure that the genetic information is retained through successive cell divisions. Without telomeres, the ends of chromosomes would fuse together or be mistaken for broken DNA, leading to potential cell death or malfunction. Therefore, their protective role is essential for maintaining chromosome stability and function throughout the life of the cell.