Telomeres shorten in part because of the end replication problem that ... - dofaq.co
telomere

Telomeres shorten in part because of the end replication problem that ...

wikipedia - 01 Feb 2017
Telomeres shorten in part because of the end replication problem that is exhibited during DNA replication in eukaryotes only. Because DNA replication does not begin at either end of the DNA strand, but starts in the center, and considering that all known DNA polymerases move in the 5' to 3' direction, one finds a leading and a lagging strand on the DNA molecule being replicated.

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