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Algae

Algae. Biology 11. Kingdom Protista: Characteristics. Eukaryotic have membrane bound organelles and a nucleus Lack complex organ systems Live in moist environments. Characteristics of Protists cont. Can be: Unicellular or multicellular Microscopic or very large

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Algae

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  1. Algae Biology 11

  2. Kingdom Protista: Characteristics • Eukaryotic • have membrane bound organelles and a nucleus • Lack complex organ systems • Live in moist environments

  3. Characteristics of Protists cont.. Can be: • Unicellular or multicellular • Microscopic or very large • Heterotrophic or autotrophic

  4. Kingdom Protista can be split into 3 groups • Animal like (ex. Amoeba, paramecium) • Fungus like (ex. slime molds) • Plant like (ex. Red, brown, and green algae)

  5. Green Algae • Very closely related to Plantae • Autotrophic • Photoautotrophs (photosynthesis used to make sugars) • Live in or near source of water (fresh or salt) • Cells have a cell wall • Lack internal transportation structures (many are only 1-2 cells thick)

  6. Can be unicellular, multicellular, or colonial • Colonial: group of unicellular organisms that live together in close proximity • Benefits such as defense

  7. Chlamydomonas • Single cellular • Found in fresh water • Uses two flagella to move

  8. Spirogyra • Single cellular • Forms thread like colonies (filaments)

  9. Colonial Species • Gonium • Volvox

  10. Sea Lettuce (Ulva) • Multicellular • Rocky coasts (marine) • 1-2 cells thick (very thin)

  11. Reproduction Biology 11

  12. Alternation of Generations • Alternates between haploid multicellular form and diploid multicellular form within one life cycle • Diploid: 2 copies of each chromosome (full set) • Haploid: 1 copy of each chromosome (half set) • Characteristic of kingdom plantae

  13. Diploid individual called sporophyte (2N) • Produces spores by meiosis that develop into haploid form • Haploid spores grow into male or female gametophyte gametophyte • Produces gametes (1N) by mitosis

  14. Fertilization of two gametes results in diploid zygote (2N), which develops into multicellular sporophyte

  15. In some species the sporophyte and gametophyte generations have different structures (look different). • In other species, sporophyte and gametophyte generations look identical (but still have different chromosome numbers)

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