“To begin with, scientifically something very radical occurs between the processes of gametogenesis and fertilization—the change from a simple part of one human being (i.e., a sperm) and a simple part of another human being (i.e., an oocyte—usually referred to as an “ovum” or “egg”), which simply possess “human life,” to a new, genetically unique, newly existing, individual, whole living human being (a single-cell embryonic human zygote).”  – Dianne Irving, Biochemist, Georgetown University