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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.
When two opposite mating hyphae meet, they produce structures called progametangia. Cell walls form to separate the tips of the progametangia into gametangia. Plasmogamy occurs between the two gametangia forming a zygote. Nuclear fusion takes place within the zygote.he cell walls of the hyphae are made of chitin, a nitrogen containing polysaccharide that is strong but flexible. The cytoplasm is multinucleate and the hyphae may have septa, which are cross-walls used for more strength. Fungi can grow rapidly because of the structure of their mycelium.