A-DNA is similar to B-DNA, but with a shorter helix. B-DNA is the most common kind, and has a major and minor groove with a similar depth. Z-DNA is left-handed, whereas A and B-DNA are right handed....
These forms can exists at different sections on the same strand but never simultaneously at the same region since they contradict each other. The vast majority of DNA is in the B form. B-DNA is a...