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Lecture 1 Review

1. We currently recognize six Kingdoms of Life on earth: Archaebacteria, Eubacteria, Protista, Plants, Fungi, and Animals.

2. Life cycle of plants involve an alternation of generations where plants alternate between a diploid (sporophyte; 2N) and haploid (gametophyte; 1N) phase.

3. Sporophytes (2N) undergo a reduction division (meiosis) to produce haploid spores (1N).

4. Haploid spores (1N) produce gametophytes (via mitosis), which in turn produce male and female gametes (1N).

5. Gametes (1N + 1N) fuse to form zygote (2N); zygote divides by mitosis to form sporophyte.

6. Examples: Ulva, Oedogonium, Fucus; illustration of the major differences between sporophyte and gametophyte stages in some organisms.

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Last updated April 4, 1997.