What advantage does dna gain by being double-stranded?

The advantage of being double stranded in DNA is that double strands makes it much more stable. Having two alleles for one gene gives variation.  Double Stranded DNA can tolerate many risk factors from the homeostasis' processes that is  keeping the cells alive. Double-stranded DNA ensures that the actual genetic information is less likely to react, and it can be opened in the case of replication and transcription.  Another advantage of double strand DNA is the ability of the cell to create a new portion of DNA in case of DNA damage, by using the non-damaged strand.