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Alternation of Generations (plants has two alternating forms in its life…
Alternation of Generations
plants has two alternating forms in its life cycle
haploid
multicellular 1n individuals (gametophytes) produce multicellular 2n individuals (sporotophytes)
diploid
multicellular 2n individuals (sporotophytes) produce multicellular 1n individuals (gametophytes)
sporophytes (2n)
multicellular individual produce spores by meiosis
haploid spores develop into new organisms without fusing with another reproductive cells
spores undergoes mitosis and become new multicellular genotophyte
gametophytes (1n)
multicellular individuals that produce gametes
gametes fuse n fertilization to produce zygote
zygote is diploid cell that will become spore-forming sporophyte
dominant generation
land plant differ as to which generation is dominant (conspicuous)
sporophytes is dominant
pine trees
peach trees
ferns
the shift to sporophyte dominance is adaptation to land
gametophytes is dominant
mosses
gametophyte becomes reduced in size and dependent on sporophyte