2005_campbl30

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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2 Gymnosperms Gymnosperms have seeds and vasculature but not flowers nor fruit Gymnosperms “Gymnosperms are plants that have “naked” seeds that
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This note was uploaded on 06/03/2011 for the course BIO 113 taught by Professor Swenson during the Spring '08 term at Ohio State.

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

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