Once a Darwinian process gets going in a world, it has an open-ended power to generate surprising consequences: us, for example.

The biomorph in the middle is the parent, and around it are its children, each with one gene mutated. Click a child to make it the parent and breed from it. Click the parent for a new litter. Hover over a biomorph to see its genes, with the one that changed from its parent highlighted.