What prevents evolution?

[Matt R.]

Magic_Man,
I just thought of something. Look up the organism Wolbachia. It is vastly more complex then a single mutation (it's an entire species of bacteria), but it drastically effects the reproductive capabalities of the host. Much in the same way your example was describing. You may find it interesting.

Edit -- you may need to dig into it a bit more than just the wikipedia article (just checked wiki). The way it effects the reproduction and evolution of the insects it inhabits is pretty intricate. Googling should turn up some nice stuff. Edit #2! -- There are some more detailed links FROM the wiki site. So there you go [img]/images/graemlins/smile.gif[/img].