Debating Where Life Begins

June 24, 2010

Fertilization in humans and other mammals produces a new member of the species in the embryonic stage of its natural development. That is to say, the entity produced by the union of spermatozoon and oocyte is a complete, though developmentally immature, organism. Unlike the gametes — the sperm and egg cells independent of each other — it is no mere part of another organism, nor is it merely something that can be used to produce a complete organism. At fertilization, the ovum and the sperm cease to be and something new comes to be — an organism (the embryo) whose genetic constitution and epigenetic state orient and dispose it to develop in the direction of maturity as a member of the species. (National Review Online)