Genotypes, phenotypes, and survival, oh my!

So far my game is going to involve survival of the fittest (Yes, it's very much a fairy-tale) and I'm going to implement alleles and mendelian inheritance. Mutations (being random) are all going to be downhill, but sometimes that can be a good thing as with the loss of wings or legs when they are not suitable for the environment.

No evolution is going to happen (Not of the amoeba to man kind anyway), just changing in the frequency of alleles and some (mostly) harmful mutations.

This will all make a bit more sense when the game is finished.