karyogamy

Karyogamy is the fusion of cell nuclei, a crucial step in sexual reproduction. This process occurs after plasmogamy, which is the fusion of the cell's protoplasts, bringing together two compatible haploid nuclei. Karyogamy then results in the fusion of these haploid nuclei to form a single diploid nucleus, creating a zygote. This diploid zygote contains a complete set of chromosomes, with one set inherited from each parent. In many organisms, including fungi, this fusion is followed by meiosis, a type of cell division that reduces the chromosome number back to a haploid state, typically incorporated into spores. Gametes, which are reproductive cells containing half the genetic material, are involved in this fusion process during fertilization.123