Once the sperm and egg comes together, they cease to be sperm and egg. Conception is when human life begins
The Developing Human: Clinically Oriented Embryology, a widely used embryology text, write that “human development begins at fertilization when a male gamete or sperm unites with a female gamete or oocyte(ovum) to form a single cell – a zygote. This highly specialized, omnipotent cell marked the beginning of each of us as a unique individual.”
T.W. Sadler’s Langman’s Embryology states, “The development of a human begins with fertilization, a process by which the spermatozoon from the male and the oocyte from the female unite to give rise to a new organism, the zygote.” Dr. Watson A. Bowes of the University of Colorado Medical School stated, “The beginning of a single human life is from a biological point of view a simple and straightforward matter – the beginning is conception.”
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