In plants with alternating sexual/asexual life cycles, the gametophyte is the sexual, haploid generation. Gametophytes produce gametes, which fertilize to create a diploid cell that will develop into the sporophyte. In flowering plants, the gametophyte generation is very small, consisting of the pollen (male) and embryo sac (female).  In bryophytes, a class of plants involving mosses, hornworts, and liverworts, the gametophyte is the dominant generation.


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