 The donation and transfer of human gametes (eggs and sperm) for reproductive purposes raises many important and difficult questions. Some of these relate directly to policy and practice; others are more conceptual. Gamete donation occupies an interesting position within bioethics, having something in common both with other forms of donation (blood and organs, for example) and with reproductive technologies not involving donation (ranging from IVF through to more controversial areas like cloning, embryo selection, and genetic modification). It also shares some features with adoption and surrogacy, practices which also (arguably at least) involve the transfer or delegation of parental duties and rights. (See the entries on  cloning,  eugenics,  feminist perspectives on reproduction and the family,  the donation of human organs, and  parenthood and procreation.)