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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.
the union of male and female gametes to form a zygote from which the embryo develops. The process usually takes place in the outer one third of the fallopian tube of the female when a spermatozoon, carried in the seminal fluid discharged during coitus, comes in contact with and penetrates the ovum.erÂ·tilÂ·iÂ·zaÂ·tion. n. The union of male and female gametes to form a zygote, a process that begins with the penetration of the secondary oocyte by the spermatozoon and is completed with the fusion of the male and female pronuclei.