The Haplodiplontic Life Cycle in Land Plants
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Every land plant alternates between a multicellular haploid gametophyte and diploid sporophyte generation — the haplodiplontic cycle locked per Bio 1001, also called alternation of generations.
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A liverwort's flattened thallus is its gametophyte; the stalked capsule growing from it is a separate sporophyte generation.
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A plant's two generations are not one organism twice — they are separate bodies with different chromosome numbers.