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The gametophytes represent a very small percentage of cells in plants. They are the result of a plant that has undergone mitosis to produce gametes, because that plant was already at a haploid chromosome count, with the number of full chromosomes (diploid) being divided by two. So the female gamete was fertilized by the male gamete, and the result was a gametophyte with a diploid chromosome count. The female gamete is called an embryo sac, while the male gamete is called pollen. This is the case with angiosperms, the plants that produce flowers and encase their seeds within the flower or within the fruit that is produced. Think of an apple; where are the seeds? Housed in the center, what we call the apple core. For gymnosperms, the process is similar, except there are no flowers. The seeds develop in cones, which then open and disperse the seeds, or on the end of stalks, as is the case with the ginkgo bilboa tree.
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