Whenever DNA replicates, a little is removed from the end, like a photocopy that was not aligned correctly. Telomerase adds a little to the end of the DNA, in a line of useless letters reading TTAGGG that the DNA can lose without a loss of functions within the cell. A good animation of how this occurs is posted bellow under the For Further Information, Try: tab that I highly recommend seeing.
-bexchada
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