Biology vs. Moral Objectivity

In 1986, Wilson and Ruse argued that with a better understanding of evolutionary biology, one can apply principles of biology to the study of moral philosophy, and that there are no "extrasomatic moral truths". This paper attempts a defense of moral objectivity based on three analogies between mathematics and ethics. An objection to this defense based on dissimilarities between the two fields is examined and found wanting, but a more powerful objection based on denying the independent existence of mathematics forces a direct examination of Wilson and Ruse's argument. It is found that their conclusion is too sweeping to follow from the arguments they present, but that the possibility it might be correct still exists.