What is a Zygote?
By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 13/11/2019
A zygote is the cell resulting from the union of an egg and a sperm after fertilization. It corresponds to the first stage of life and from it the embryo will be formed after successive cell divisions.
In the zygote, the pro-nuclei from the ovum and the sperm are fused in order to restore the chromosome endowment of the human species: 46 chromosomes, 23 of maternal origin and 23 of paternal origin.
In addition, the zygote is also formed by a hard zona pellucida that surrounds and protects it, by two polar corpuscles in the perivitelline space and by the cytoplasm that surrounded the nucleus.
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