During meiosis the chromosome is haploid while during fertilization two gametes fuse and create a diploid cell.
Sporophytes undergo meiosis and produce spores, these spores undergo mitosis and form a haploid gameopohyte, these gameophytes under go mitosis as well and create either and egg or a sperm cell. The sperm cell fuses with an egg cell or vise versa and undergo fertilization which produces a diploid zygote. This zygote develops into a saprophyte and then the process starts over.
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