The Embryonic Period (The First 8 Weeks) Embryonic Development: The First 4 Weeks Chapter 3 Fertilization. Biologically speaking, "human development begins at fertilization," [13] when a woman and a man each combine 23 of their own chromosomes through the union of their reproductive cells. A woman's reproductive cell is commonly called an "egg" but the correct term is oocyte (ō´ō-sīt).
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