lab_04 - Lab 4: Plants II The Evolution of Seed Plants...

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    Lab 4: Plants II –  Lab 4: Plants II –  The Evolution of Seed Plants The Evolution of Seed Plants Homospory vs. Heterospory Gymnosperms Phylum Cycadophyta Phylum Ginkgophyta Phylum Coniferophyta Phylum Gnetophyta (gymnosperm) fossils Pine Life Cycle / Seed Development Tree Identification Activity Initiation of Seed Germination Experiment
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    Homospory vs. Heterospory Homospory vs. Heterospory homospory  - “same spore” sporophyte makes one type of spore thus, only one type of gametophyte gametophyte makes both antheridia and  archegonia, and thus both sperm and eggs
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    Alternation of Generation (Sporic Meiosis) Alternation of Generation (Sporic Meiosis) meiosis meiosis fertilization fertilization 2N 2N 2N 2N 1N 1N 1N 1N 1N 1N mitosis mitosis mitosis mitosis gametes gametes (zygote) (zygote) spores spores gametophyte gametophyte sporophyte sporophyte diploid (2N) diploid (2N) generation generation haploid (1N) haploid (1N) generation generation
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    Homospory vs. Heterospory Homospory vs. Heterospory heterospory  – “different spore” sporophyte makes two types of spores  (megaspores and microspores) two gametophyte sexes: microspore   male gametophyte   sperm megaspore   female gametophyte   egg(s)
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    Task A-1: Observation of  Task A-1: Observation of  Homospory Homospory example: 
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This note was uploaded on 02/24/2009 for the course BIOL 1031 taught by Professor Bowling during the Spring '08 term at Auburn University.

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lab_04 - Lab 4: Plants II The Evolution of Seed Plants...

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