After fertilization of the maternal egg with the paternal sperm, the zygote appears.
The zygote is the first stage of an embryo, which has only one cell. The paternal and maternal nuclei have fused and the embryo has 46 chromosomes, which is the normal genetic endowment of a human being.
Read the full article on: What’s the Difference Between Zygote, Embryo & Fetus? ( 49).
By Aitziber Domingo Bilbao B.Sc., M.Sc. (embryologist), Andrea Rodrigo B.Sc., M.Sc. (embryologist), Eric Saucedo de la Llata M.D. (gynecologist), Marta Barranquero Gómez B.Sc., M.Sc. (embryologist) and Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 06/05/2024
