BIOA02H3 : Lec01 - Tree of Life.doc
22 Apr 2012
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BIOA02H3 Full Course Notes
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Slide one : bryophytes aka mosses, typically very small / inconspicuous, compare bryophyte life cycle to others. Slide four/five/six : green algae are the evolutionary predecessors of plants. Slide seven : bryophytes are represented by four main branches of plants, liverworts, two mosses, hornworts, bryophytes don"t fossilize very well. Slide eight : angiosperms largest, bryophytes second largest. Lycophytes second smallest: gymnosperms smallest. Flattened bodies: grow right on top of soil, grow reproductive structures (umbrella-like) Flattened and small: grow in cushion packs or more spread out in groups. Slide eleven hornworts: main body is similar to liverworts, don"t grow umbrella-like structures but rather horns. First generation consists of sperm and egg which are haploid. Diploid generation undergoes mitosis from zygote to embryo and again into sporophytes. Sporophytes undergo meiosis into individual spores (reduction) Mitosis again into gametophyte: mosses have haploid lifecycle dominance, flowering plants and gymnosperms have diploid lifecycle dominance.
