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14 Cards in this Set
- Front
- Back
Meiosis
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the cell division creating haploid daughter cells with only one set of
chromosomes |
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Spores
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Result of meiosis. 1N
In angiosperms: pollen grains and egg sacs (inside ovules). First cells of gametophyte generation. |
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Gametophyte
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Independant 1N individual. Eventually produces egg and sperm - the gametes (gamete bearer).
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Zygote
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2N fusion of egg and sperm after fertilization becomes sporophyte.
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Sporophyte
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2N individual. Develops sporangia to produce spores (spore bearer).
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Pollination
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the act of transferring pollen from anther or male cone to stigma or female
cone; restricted to seed plants |
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Fertilization
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the act of fusion between sperm and egg – must follow pollination in seed
plants; fertilization occurs in all sexually reproducing organisms. |
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Gamete
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the haploid cells that participate in fertilization, egg and sperm. These are
produced by specialized structures in the gametophyte generation of plants called gametangia. In flowering plants the gametophytes are so reduced (pollen grain and embryo sac) that distinct structures are not found. |
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Gametophytes in angiosperms
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Pollen and 8 celled egg sac
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Polar nuclea
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Two nuclei in a cell in embryo sac with 6 eggs
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3n triploid endosperm
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The fertilized polor nulceli cell that serves as nutient source for developing embryo
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Integuments
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Double layer around embryo sac. Collectively called the ovule.
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Antheridium
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Structure on gametophyte that produces the sperm
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Archegonia
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Structure on gametophyte that produces the eggs.
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