Alternation of Generations: A life cycle in which there is both a multicellular diploid form, the sporophyte, and a multicellular haploid form, the gametophyte.
Sporophyte: the multicellular diploid form that results from the union of gametes.The sporophyte produces haploid spores by meiosis that develop into gametes
Gametophyte: the multicellular haploid form that produces haploid gametes by mitosis. The haploid gametes unite and develop into sporophytes.
The gametophyte produces haploid gametes by mitosis, then two gametes unite and form a diploid zygote by fertilization. The zygote developes into a multicellular dipoloid sporophyte and then that sporophyte produces haploid spores by meiosis. Then the spores develop into multicellular haploid gametophytes.This cycle, from gametophyte to gametophyte, is the way in which all land plants and many algae undergo sexual reproduction.
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