As explained above, the zygote is the first stage of human development right after fertilization occurs. It is the result of the fusion between gametes: the haploid ovum cell from the female and the haploid sperm cell from the male. The resulting diploid cell is what we know as zygote.
Zygote or embryo, which comes first?
By Andrea Rodrigo B.Sc., M.Sc. (embryologist).
Last Update: 02/02/2017
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.