Who would decide whether scientist should pursue research that possess ethical dilemmas?

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

This is true hope this

He used pea plants to study the patterns of heredity.