Which process occurs in fungi and has the opposite effect on a cell's chromosome number than does meiosis?

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Karyogamy occurs in fungi and results in the fusion of two haploid nuclei to form a diploid nucleus, which has the opposite effect on a cell's chromosome number than meiosis. Mitosis (A) is a process of cell division that results in two daughter cells with the same chromosome number as the parent cell. Plasmogamy (B) is the fusion of two cytoplasm from two different individuals, which could lead to a cell with a higher chromosome number, but not the opposite effect of meiosis. Crossing over (C) is a process that occurs during meiosis and results in genetic recombination but does not affect the chromosome number. Binary fission (D) is a process that occurs in prokaryotic cells and results in two genetically identical daughter cells with the same chromosome number as the parent cell.

Which Process Occurs in Fungi and Has the Opposite Effect