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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.
Best Answer: Zygote Formation and Development of the Embroyo Zygote Formation If sperm are present in the oviduct at the time of ovulation, fertilization takes place in the oviduct. Zygotes form as a result of fertilization.In fertilization, the egg nucleus (containing the haploid number, or n chromosomes) unites with the sperm nucleus (containing n chromosomes). This union produces a zygote of the original diploid or 2n chromosome number.t is formed when the Male and Female haploid cells-Gametes -, sperm and egg, join fertilising the egg and forming the Zygote. Haploid cells having half the normal number of Chromosomes, they have 23. Hugh D Morris Â· 7 years ago.