what cultural fears doe mr. hyde represent?

Really he represents the strict Victorian cultural fear of losing control or indulging in one's dark side. Sigmund Freud and his whole idea of the "id" was a great novelty around this time. The "id" represents our primal urges. Unconstrained appetites were feared by Victorian English society and Hyde represented an indulgence in such behaviour with no remorse. People found this story both scandalous and appealing.