One gene per 10k years seems slow enough that most alterations could be transmitted through the global population by now. Another problem I have with your model is that it deals in years, not generations.
[QUOTE][b]An offspring somehow has a new gene (mutation, copying error, etc.), so what will happen when it mates? Assuming it's still reproductively compatible with others of its species, what will happen to this new gene when the haploid sperm and egg combine?[/QUOTE]