11/19/2012 - pannoneapbio.weebly.com
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• Haploid (n) organism = gametophyte
• Diploid (2n) organism = sporophyte
Alternation of generations:
life history having a multicellular haploid stage which alternates
with a multicellular diploid stage
Evolutionary trends:
• Earlier organism have dominant gametophyte (n) individual
the gametophyte generation is the major stage in the life of
mosses, the visible stage in fungi, and is an independent plant in ferns.
• However, the gametophyte is only an inconspicuous structure within
the flower or other reproductive organs of "higher" plants
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