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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.
1 The female gametophyte remains inside the female megasporangium, which is surrounded by sporophyte integuments. 2  This structure is known as an ovule. 3  Eventually, after the ovum is fertilized and becomes a zygote, the ovule will become a seed.4  The outer covering, the seed coat is derived from sporophyte tissue.he Gametophyte of the Anthophyte. You saw the cherry tree above. To see the gametophytes, we need to examine that structure unique to the Anthophytes, the flower. 1  The microsporophylls are the stamens, each tipped by the anther, which contains the diploid cells that will divide to become microspores.