The theory of reciprocal altruism, which has become an important breakthrough in the discussion on the origins of morality, raises the question of the foundations of ethics. It also poses many problems, such as the question of determinism and relativity of moral norms. This article tries to explain how the moral sense has become part of our biological endowment. It subjects to critical analysis the theory of Richard Joyce who seeks foundations of ethics in normative reasons. It also recalls Peter Singer’s reflections on sociobiology and the beginnings of ethical thought showing the way of a possible transformation that has taken place from our empathy to relatives or a group, to the moral code which rejects different forms of discrimination.
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