What happens at the wings when the yoke is pulled backwards?
Most aircraft have control surfaces that work in a similar manner from a little Piper up through a 747. Forward and back movement of the yoke or stick typically results in actuation of the elevator. For aircraft that have the common style empennage the wing remains unchanged. For aircraft that have elevons they move accordingly.

Pulling away from the front of the aircraft on the control column causes the aft end of elevator to move upwards relative to the airframe. This action causes the aircraft to pitch nose up. 

Pushing towards the front of the aircraft on the control column causes the aft end of the elevator to move down relative to the airframe. This action causes the aircraft to pitch nose down.  

Take a look at this GIF for a nice animation or this video.