Answer: After fertilization (as evidenced by today's science.)
The zygote (single cell embryo) is a life different from their parents and human life (presence of Alu gene sequences, specific to the human species). And the zygote is also the only totipotent cell "contains" as each and every one of the structures are the individual of the human species.
From the moment of fertilization are therefore facing a new human being.
reading: "Codes of Life" (book): p.8-Barahona and JCAbellán.Editorial 18.M.López Homolegens, 2009.
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