The Haplodiplontic Life Cycle
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In a haplodiplontic life cycle, an organism alternates between a multicellular diploid sporophyte and a haploid gametophyte, meiosis and mitosis each producing one generation.
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A plant's diploid sporophyte produces haploid spores by meiosis, and those spores grow by mitosis into a haploid gametophyte.
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This haplodiplontic cycle — alternation of generations — is not a haplontic or diplontic cycle with an extra step.