2005_campbl30

2005_campbl30 - Chapter 30: Plant Diversity II: The...

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Chapter 30: Plant Diversity II: The Evolution of Seed Plants
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Free-Living Gametophytes
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Reduced Gametophytes
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Some Seed-Bearing-Plant Anatomy Gender Female Male Sporangia Megasporangia Microsporangia Spores Megaspores Microspores Gametophyte Megagametophyte Microgametophyte Gametangia Archegonia Antheridia Gametes Egg Sperm
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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
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Seeds (are complicated) Gametophyte (haploid parent) Sporophyte (grandparent) Sporophyte (next generation)
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Gymnosperms Gymnosperms have seeds and vasculature but not flowers nor fruit
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“Gymnosperms are plants that have “naked” seeds that are not enclosed in
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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 - Chapter 30: Plant Diversity II: The...

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