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gametophyte (gÉmÄËtÉfÄªtË) [ key ], phase of plant life cycles in which the gametes, i.e., egg and sperm, are produced. The gametophyte is haploid, that is, each cell contains a single complete set of chromosomes, and arises from the germination of a haploid spore.
Alternation of generations overview. the gametophyte produces haplod gametes by mitosis; two gametes unite and form a diploid zygote; the zygote develops into a multicellular diploid sporophyte; the sporophyte produces haploid spores by meiosis; the spores develop into multicellular haploid gametophytes.porophyte. in organisms (plants and some algae) that have alternation of gnerations, the multicellular diploid form that results from the union of gamtes; it produces haploid spores by meiosis that develop into gametophytes.