Many genomes: variation

Am I unique?

Yes. Although, at the level of our DNA, researchers currently think that any two human beings are more than 99% alike, there are differences between us*. These differences can be small changes in a single DNA letter or duplicates and deletions of much larger chunks of DNA.

*At the DNA level, only identical twins are expected to be exactly alike, but even then, each individual twin is shaped by their environment and the lifestyle they lead.