Sexual Reproduction
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The familiar forms of seed plants and vertebrates are diploid: each cell contains a nucleus with a pair of each chromosome. In contrast, fungi are haploid. Sexual reproduction in fungi occurs by the fusion of hyphae and—perhaps much later—the fusion of two haploid nuclei to form a zygote, which is the only diploid. Fungal zygotes only divide by meiosis (reduction division); haploid spores. are the product of zygote division.
