third person i would guess but there is not enough information about what you are reading to show really what point of the story is in.
There are three main differences between nuclear and mitochondria DNA (mtDNA): 1.) mtDNA is circular, whereas nuclear DNA is linear. (Both are double stranded) 2.) mtDNA is (generally) uni-parentally inherited, in most animals (not mussels though for example), mtDNA is passed from mother to offspring. from wiki
Dramatic Irony is irony that is inherent in speeches or in a situation of drama and is understood by the audience but not grasped by the characters in the play.