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â¢ ALTERNATION OF GENERATIONS (noun) The noun ALTERNATION OF GENERATIONS has 1 sense: 1. the alternation of two or more different forms in the life cycle of a plant or animal. Familiarity information: ALTERNATION OF GENERATIONS used as a noun is very rare. Dictionary entry details.
Alternation of Generations. All Embryophytes and some algae undergo an Alternation of Generations. Each generation of offspring has a different ploidy than the generation before it. Generations alternate from diploid to haploid to diploid to haploid, etc. sporophyte (2n) --> gametophyte (n) --> sporophyte (2n) --> gametophyte (n) --> sporophyte (2n) etc... In short: 1. a haploid (n) gametophyte generates gametes (n) via mitosis 2. gametes fuse to form a diploid (2n) zygote 3. zygote grows mitotically into the sporophyte (2n) 4.