Use a series of ropes to serve as chromosomes that kids can hold as they walk through the steps of mitosis and meiosis. The blogpost outlines how to do it with your sixth, seventh, or eighth grade students. Great for teaching genetics in a middle school science classroom. This is one lesson in a series of hands-on explorations in a unit on genetics and heredity. This lab activity works well for 6th, 7th, or 8th grade science students.