The staircase to the girls' dormitory in Gryffindor is enchanted to become smooth when a boy is trying to climb it.
He was on the sixth stair when it happened. There was a loud, wailing, klaxonlike sound and the steps melted together to make a long, smooth stone slide. There was a brief moment when Ron tried to keep running, arms working madly like windmills, then he toppled over backward and shot down the newly created slide, coming to rest on his back at Harry’s feet. “Er — I don’t think we’re allowed in the girls’ dormitories,” said Harry
If a boy were to take a polyjuice potion of a girl, would they be able to pass the staircase? If there is no concrete evidence pointing to one way or the other, is there at least any references as to whether the polyjuice potion can fool enchantments or spells similar to this?