Making A Dynamic Form List?

What I need to do is create a dynamic select list using several sets of arrays.Example: fav color, fav car and fav genre.The trick is I need to use three radio buttons to control what is seen in the list.So if a user click radio button 1, the list changes values to one of the arrays.And if they click radio 2, the list changes to the values to another array.This is a learning process. I will really appreciate if anyone can help me on this.I can build the arrays, what I do not know how to do is make the list dynamic so that it fetches data from the arrays when a radio button is clicked.