Plant_Evolution

Plant_Evolution - The origin of Embryophytes Embryophyte...

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The origin of Embryophytes
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Embryophyte and cuticle
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Reduction of Gametophyte
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Sporophyte Advantage Having 2 copies of each chromosome enables mutations to exist without resulting in death. There is more UV over land than in water. As plants evolved the gametophyte has been reduced.
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Fig. 22.5, p. 345 Zygote grows, develops into a sporophyte while still attached to gametophyte. Fertilization zygote Sperm reach eggs by moving through raindroips or film of water on the plant surface. sperm-producing structure at shoot tip of male gametophyte. egg-producing structure at shoot tip of female gametophyte. rhizoid Diploid Stage Haploid Stage Mature sporophyte (spore- producing structure and stalk), still dependent on gametophyte. Meiosis Spores form by way of meiosis and are released. Spores germinate. Some grow and develop into male gametophytes. Other germinating spores grow and develop into female gametophytes. Archegonium Antheridium Sporangium
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Embryophyte and cuticle Lignin in cell walls
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Tracheid Cells Primitive xylem cells that have 2 functions: Support (secondary cell walls with lignin) Water transport Many older resources call all vascular plants “tracheophytes”
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Tracheid Advantages Plants can now grow taller because: They can support the mass They can transport water throughout the plant.
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This note was uploaded on 11/16/2011 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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Plant_Evolution - The origin of Embryophytes Embryophyte...

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