Here are some papers to look at:

I know you have the citation, but here is useful diversity via multiploidy pdf in case you want to see the actual paper. A quite appropriate project might be to investigate the very many possibilities for operators (different ways of doing crossover and mutation) on these complex chromosomes. This paper only looked at very few. Also, as we discussed, doing it with a dynamic problem or two

Here is a later paper by Collingwood, after she became Hart, on almost precisely what we were talking about -- investigating diploidy on a nonstationary (dynamic) problem. dom.pdf

Meanwhile, Jurgen Branke is the force behind much of the recent interest in dynamic problems. See here, which provides a nice descripion of such problems, a benchmark problem, and review of ways to address these problems. Here: http://www.aifb.uni-karlsruhe.de/~jbr/MovPeaks/ is a page all about the `Moving Peaks' benchmark problem. Perhaps you could extend the work in `useful diversity' by applying it to that?

Here's a short and ageing review, which may be useful: ga-adapt.pdf ; try to find more useful things yourself by using http://scholar.google.com .