Originally posted by: Riprorin
You need to study genetics and embryology:
The fertilized egg or zygote contains all of the genetic material needed to create the fully expressed individual and includes inherent complex encoding for individual human interjection and all the other associated qualities characteristic of human personhood.
We can take a single cell or zygote from a human being, a gorilla and a mouse and subject them to forensic testing and definitively identify each species. Moreover, if one or two cells were removed from a developing human embryo and either typed as to their individual specific DNA pattern or stored away, they could be used many years later to identify the adult individual.
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You have not provided an argument as to why a zygote or fetus should be conceptualized as a human being or person.
(btw I have studied genetics and embryology, I studied medicine for three years.)