Monday, April 18, 2011

Alternation of Generations

  Alternation of generation is a word that describes the plant's life cycle.  It is a multicellular diploid form with a multicellular haploid form, and the elements of alternation of generation are two haploid gametes, two diploid gametes, sporangia, and gametangia.  The two processes of alternation of generation are meiosis and fertilization.  Meiosis is reduction of chromosomes from diploid number to haploid number, and fertilization is the fusing of chromosomes from haploid number to diploid number.  Similar to animals, the alternation of generation is also the sexual reproduction of plants, and it is an essential part of plants.  On the other hand, fungi or algae have alternation of generations as well as plants; hence, this is not a unique life cycle of plants.

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