Our cultural features are an outgrowth of our genetic heritage. We evolved to be social beings, to have one mate (although this trait is not as strong as in other species), to invest a lot of effort into our offspring, etc. Our cultures reflect these genetic imperatives. However, there are a variety of cultural behaviors that can manifest which are different from each other yet still function to fulfill our biological imperatives.
Ah yes, Confucianism is an outgrowth of slanty eyes. Without Darwinism we wouldn't have known that.