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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.
Biflagellate isogametes are formed by certain cells of the haploid, gametophyte plant. These are liberated and fuse in pairs to form a diploid zygote(2n) which germinates to form a separate diploid plant called the sporophyte(2n). This resembles the haploid (n) gametophyte plant in outward appearance.Certain cells of the sporophyte(2n) undergo meiosis and form zoospores in sporangia; these zoospores are quite different to the gametes in that they form quadriflagellate zoospores (with 4 flagella).These are released, swim around for a time, settle and germinate to form the haploid (n) gametophyte thallus.iflagellate isogametes are formed by certain cells of the haploid, gametophyte plant. These are liberated and fuse in pairs to form a diploid zygote(2n) which germinates to form a separate diploid plant called the sporophyte(2n). This resembles the haploid (n) gametophyte plant in outward appearance.