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Dominance in alteration of generations
Sporophyte
Seed adaptation
Dispersal, used to transport and nurture embryos
Ovules in female cones
Ovule (2n) produces female spores (n)
Makes a female gametophyte through mitosis
Egg nuclei retained in cone
Stacked female sporophylls
Pollen from male cones
Produces male spore → male gametophyte with a specialized sperm nuclei
Tiny, released into wind for dispersal
Find an ovule = pollination/fertilization
Seeds
Fertilized ovule, released for dispersal
Consists of:
1) seed coat from parental sporophyte (2n)
2) food supply from female gametophyte (n)
3) embryo (new sporophyte) (2n)
Gymnosperm features
Vascular plants with naked seeds
Sporophylls arranged in cones
Seeds exposed on female sporophylls