does mitosis begin the gametophyte stage of the life cycle
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. In some types of plants and algae (e.g. Ulva) gametes are isogamous --that is, the gametes are all of one size, shape and general morphology.