Chapter 29

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Author:
kamrunsreno
ID:
177398
Filename:
Chapter 29
Updated:
2012-10-13 16:51:41
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Biology
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Description:
Exam 2
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  1. Alternation of generations life cycle
    • Two multicellular bodies
    •       Diploid sporophyte (2N), haploid gametophyte (N)
    • Spores produced by sporophyte
    •      By meoisis, in structures called sporangia
    •      Spores germinate to create gametophyte
    • Gametes produced by gametophyte
    •     By mitosis, in structures called gametangia
    •           Eggs in archeogonia, sperm in antheridia
    •      Fertilization occurs to produce sporophyte
  2. Byrophytes
    • Dominated by the gametophyte generation
    •      Gametophyte is larger, more obvious
    •      Sporophyte is dependent on gametophyte
    •           Gametophyte photosynthesizes, shares food
    • Don't have true leaves, roots, or stems
    •      Those organs are defined by vascular tissue
    •      Have simpler structures ex. rhizoids
    • Example: Mosses
  3. Moss Life Cycle
    • 1) Gametophyte gametes lead to sporophyte
    •      Sporophyte remains attatched to gametophyte
    •           Attatchment is called the foot
    • 2) Sporophyte capsule releases spores
    •      Capsule elevated by seta (stalk)
    • 3) Spores produce gametophyte
    •      Initial spore germination creates protonema
    •      Protonema becomes mature gametophyte
  4. Pteridophytes
    • Vascular plants
    •      Have xylem and phoem conductive tissue
    • Life history dominated by the sporophyte
    •      Sporophyte initally dependent on small gametophyte
    •      Sporophyte develops to become large and self-sufficient
    • Example: Ferns
  5. Fern Life Cycle
    • Sporophyte produces sporangia
    •      Spores are released
    •      Sporophyte has leaves (fronds), stem (rhizome), & roots
    • Spores germinate to produce gametophyte
    •      Small and sometimes heart-shaped
    • Gametophyte produces gametes
    • After fertilization, sporophyte develops

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