BIO 200 Lecture Notes - Lecture 14: Symbiogenesis, Brown Algae, Red Algae
3 Apr 2017
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Document Summary
Land plants make a big shift in the organisms we"ve been discussing. The invasion of land is one of the more complex feats in evolutionary history. The diplontic life cycle-only diploid stage undergoes mitosis. The haplodiplontic life cycle-multiple diploid and haploid stages. Swimming particles are great in aquatic environments but the haploid phase gets shorter as plants evolve. Rhodophyta have multiple pigments and vary in size. Chloroplasts result from primary endosymbiosis: a single event that gave rise to red and green algae. Brown algae is an example of a secondary endosymbiosis. Land plants all arose through the green algae lineage, so are photosynthetic due to primary endosymbiosis. Chlorophytes- most green algaes, similar cell form to land plants. Stoneworts- sister to land plants, filamentous cell forms, many other homologous traits with land plants (mitosis style, cell structures) Mosses are the most recognizable bryophytes but most people wouldn"t recognize a moss sporophyte.
