What are the repetitive dna sequences present at the ends of eukaryotic chromosomes called?

Answer: They are called Telomeres.

Explanation:

Telomeres is a region of repetitive nucleotide sequence present at each end of chromosomes that protect the internal regions of the chromosome, they are cap down in a small amount t in every DNA replication.

Telomeres are found in many eukaryotic species ranging from human beings to unicellular protists.