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Pine gametophyte (outside) surrounding the embryo (inside). A gametophyte is the haploid multicellular stage in the alternation of generations life cycle of plants and algae. It develops from a spore by mitotic cell division. Spores are the products of meiosis in sporophytes.Gametophytes produce haploid gametes by mitosis.he fusion of male and female gametes produces a diploid zygote, which develops by repeated mitotic cell divisions into a multicellular sporophyte. In bryophytes (mosses, liverworts, and hornworts), the gametophyte represents the longer lived, nutritionally independent and more visible stage of the life cycle.
Finally, these plants are gametophyte dominant, meaning that the recognizable stage of these plants is the haploid gametophyte generation. The seedless vascular plants, which include ferns and fern allies, possess several adaptations lacking in nonvascular plants.Xylem and phloem are present to efficiently transport water and sugars, respectively throughout the plant body.he seedless vascular plants, which include ferns and fern allies, possess several adaptations lacking in nonvascular plants. Xylem and phloem are present to efficiently transport water and sugars, respectively throughout the plant body.