Final answer:
Triplex DNA can form under certain conditions and it is possible that triplex DNA plays a role in the formation of thymine dimers that can introduce mutations in DNA replication and transcription.
Step-by-step explanation:
Triplex DNA can form under certain conditions and it is possible that triplex DNA plays a role in formation of thymine dimers, which can stall replication and transcription and introduce frameshift or point mutations. Thymine dimers are abnormal DNA structures that can occur when two adjacent thymine bases in the DNA strand are covalently bonded.