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In human fertilization, two 1n haploid cellsâan ovum (female gamete) and a sperm cell (male gamete)âcombine to form a single 2n diploid cell called the zygote.n fungi, the sexual fusion of haploid cells is called karyogamy. The result of karyogamy is a diploid cell called a zygote or zygospore. This cell may then enter meiosis or mitosis depending on the life cycle of the species.
Information encoded in the collective DNA of the egg and sperm cell instructs the zygote to continue its development into an embryo. Within 24 hours after forming, a zygote will begin a process of cellular division that will soon lead to exponential cell growth.onception is the fertilization of the egg by a sperm cell. If you're a sperm cell entering the vagina, there's about a 1 in 250 million chance you'll be the sperm cell that reaches the egg.