The interactive model demonstrates a structure of chromosome and a view of chromosome with various magnifications. After you pressed "Start" button the slider of scroll box will move to the right and the scale of image shown in the upper part of model would change. "Start" and "Reset" buttons operate the animation. A group of switches in the right lower corner of the window operate with the direction of animation (from small scale to larger and vice versa). You may look through a surface appearance of chromosome manually dragging the slider of scroll box by mouse.