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  • the succession of sexual and asexual generations in the life cycles of many plants and such animals as Obelia Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
  • In plants, a reproductive cycle in which a usually haploid (1n) organism or tissue, the gametophyte, gives rise to gametes which, after fusion to form a zygote, develop into a usually diploid (2n) organism, the sporophyte. Spores produced by meiotic division from the sporophyte give rise to new gametophytes, completing the cycle. Source: Curtis, Helena. 1968. Biology. New York, NY. Worth Publishers