Which of the following are examples of trisomy?
turner syndrome, down's syndrome, or klinefelter's syndrome

Example of Trisomy 21 detected... the presence , which is found in Down syndrome, is calledtrisomy 21. ... Of these, Trisomy 21 and Trisomy 18 are the most common. ... XXX (Triple X syndrome); XXY (Klinefelter syndrome); XYY ... Turner syndrome (XO).   

so i think all are right

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it