Some of the most fundamental questions which moral philosophers have been grappling with include: What makes us moral beings? Is morality a product of culture or nature or both? Are ethical norms and principles universal and unchanging or are they relative, being rooted in specific socio-political and historical contexts? Can ethical conclusions be derived from descriptive statements?This book addresses these and similar questions through a comparative study between Alasdair MacIntyre's views and biological ethics. It discusses how both MacIntyre's views and biological ethics highlight the importance of human biology for human morality. Based on this discussion, the book proposes that both the rational and the biological (including the emotional) dimensions of humans have to be considered in order to understand the complex and multi-layered phenomenon of human morality. As such, it will prove to be a valuable resource for undergraduate and postgraduate students of moral philosophy, especially those interested in studying the biological approach toward ethics, Thomistic Aristotelian ethics and metaethics.