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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.
Definition of ZYGOTE INTRAFALLOPIAN TRANSFER. : a method of assisting reproduction in cases of infertility that is similar to gamete intrafallopian transfer but in which eggs are fertilized in vitro and some of the resulting fertilized eggs are inserted into a fallopian tube âabbreviation ZIFT. ADVERTISEMENT. a method of assisting reproduction in cases of infertility in which eggs are obtained from an ovary and fertilized with sperm in vitro and the resulting fertilized eggs are inserted into a fallopian tube by a laparoscopeâabbreviation ZIFT; compare gamete intrafallopian transfer.