BIOL 1105 Lecture Notes - Lecture 1: Gymnosperm, Welwitschia, Ginkgo Biloba
19 Aug 2016
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Document Summary
Green algae and land plants are from the same ancestor. Photoautotrophic but not all photoautotrophic plants are green plants. (red and green algae are excluded: green algae. Charophytes sister group to all land plants (unidentified charophyte species gave rise to all land plants) Land plants all have multicellular, haploid and diploid stages and diploid embryos. Streptophytes (charophytes and land plants: land plants have multicellular haploid and diploid stages and diploid embryos. Relatively waterproof material prevents water loss and limits gas exchange: stomata. Specialized cells for transporting water and minerals: xylem. Def: haploid and diploid stages are both multicellular. Gametophytes: gamete plant, haploid, produces gametes by mitosis. Sporophyte: spore plant, diploid spore plant produces haploid spores by meiosis. Spores grow by mitosis to produce the gametophyte. Moss: most primitive land plants, gametophyte is the dominate phase life cycle, sporophytes are the smaller brown spots, gametes are produced in the tips of the green leafy gametophyte, gametophyte is dependent on sporophyte.
