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Life Cycles Laboratory Observations of Life Cycle Stages in Protists and Plants.

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Presentation on theme: "Life Cycles Laboratory Observations of Life Cycle Stages in Protists and Plants."— Presentation transcript:

1 Life Cycles Laboratory Observations of Life Cycle Stages in Protists and Plants

2 Haplontic Life Cycle of Chlamydomonas Photosynthetic protist showing an early eukaryotic life cycle No mitosis in diploid phase Resting spore withstands poor conditions To observe: Place a drop from the cell culture between a slide and cover slip.

3 Gametangium: cell that produces gametes by mitosis Sporangium: cell that produces spores by mitosis Haplontic Life Cycle of Ulothrix Gametophyte: multicellular haploid structure that produces gametes Isogametes fuse to form diploid zygote Photosynthetic Protist No mitosis in diploid phase Zygote produces spores by meiosis Haploid gametophyte grows from spore by mitosis Gametophyte can produce gametes or zoospores Motile spores (zoospores) formed by mitosis or meiosis Spore: haploid cell that can grow by mitosis

4 Haplontic Life Cycle of Ulothrix To observe: Place a drop from the cell culture between a slide and cover slip. Include some green fibers in your sample. You do not need to distinguish between gametangia and sporangia.

5 Diplohaplontic Life Cycle of Ulva Photosynthetic Protist Introduction of Mitosis in Diploid phase Gametophyte produces isogametes Isomorphic gametophyte and sporophyte Sporophyte: multicellular diploid structure that produces spores by meiosis

6 Diplohaplontic Life Cycle of Ulva To observe: Use a scalpel and/or forceps to take a small sample of the leafy structure and place it between a slide and cover slip. You do not need to distinguish between sporophytes and gametophytes.

7 Diplontic Life Cycle of Fern Plant Smaller gametophyte Larger, longer-lived sporophyte with tissues and organs Spores produced by meiosis in sporangia on the underside of sporophyte leaves Archegonium: organ that produces eggs by mitosis contain sporangia (singular: sorus) Antheridium: organ that produces sperm by mitosis

8 Prepared Slide: Mature Antheridia Sperm within Antheridia Gametophyte with Antheridia

9 Prepared Slide: Mature Archegonia Gametophyte with Archegonia Each archegonium contains one egg

10 Prepared Slide: Young Sporling Sporling Gametophyte

11 Observation: Sorus, Sprorangia and Spores To observe: Scrape some material from the underside of a fern leaf onto a slide. Distribute it into a thin layer. Add a cover slip. Adding water is optional. Spores Sporangium Indusium


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