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2005_campbl30 - Free-Living Gametophytes Chapter 30 Plant...

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1 Chapter 30: Plant Diversity II: The Evolution of Seed Plants Free-Living Gametophytes Reduced Gametophytes Some Seed-Bearing-Plant Anatomy Male Female Gender Sperm Egg Gametes Antheridia Archegonia Gametangia Microgametophyte Megagametophyte Gametophyte Microspores Megaspores Spores Microsporangia Megasporangia Sporangia Ovules Megasporangium gives rise (meiotically) to megaspores Integument envelopes, protecting the megasporangium An ovule consists of integument surrounding a megasporangium which in turn surrounds a megaspore The female gametophyte develops mitotically from the megaspore The female gametophyte gives rise mitotically to the female gamete, the egg Once fertilized the egg develops into an embryonic sporophyte The sporophyte embryo surrounded by the parental megagametophyte which, in turn, is surrounded by grandparental sporophyte tissue is a seed Seeds (are complicated) Gametophyte (haploid parent) Sporophyte (grandparent) Sporophyte (next generation)
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