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HotFreeLayouts...Fertilization, the first stage of maternity occurs when a male ejaculates his semen into a woman’s vagina during sexual intercourse. During the process of fertilization sperm is lead up the vaginal canal and eventually the semen penetrates an oocyte, also known as the female’s egg (which is released during the process of ovulation). “The fertilization process takes up to 24 hoursâ€. The end result of fertilization is the formation of a zygote. A zygote is basically the first stage of a baby. “Within 11 hours following fertilization the egg has extruded a polar body with excess chromosomes. The fusion of the egg and the sperm nuclei marks the creation of the zygote and the end of fertilizationâ€.