A gametophyte is the multicellular structure, or phase, that is haploid, containing a single set of chromosomes.The gametophyte produces male or female gametes (or both), by mitosis. The fusion of male and female gametes produces a diploid zygote which develops from mitotic cell divisions into a multicellular sporophyte. The sporophyte produces spores from meiosis which then go back to be gametophytes!
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