Final answer:
Telomeres at the ends of eukaryotic chromosomes are replicated through the action of telomerase enzyme.
Step-by-step explanation:
The ends of the linear chromosomes, known as telomeres, have repetitive sequences that do not code for a particular gene. In humans, a six base-pair sequence, TTAGGG, is repeated 100 to 1000 times. The enzyme telomerase attaches to the end of the chromosome and adds complementary bases to the RNA template on the 3' end of the DNA strand. Once the lagging strand template is elongated, DNA polymerase adds nucleotides that are complementary to the ends of the chromosomes, resulting in the replication of the telomeres.