BIOL 1F90 Lecture Notes - Lecture 19: Sporotrichosis, Meiosis, Sporothrix Schenckii
12 Jan 2016
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Document Summary
Looking at a lush landscape, its difficult to imagine the land without any plants or other organisms. For more than the first 3 billion years of earths history, the terrestrial surface was lifeless. Since colonizing land, plants have diversified into roughly 290k living species. Eukaryotic, primarily photosynthetic organisms that mostly live on land and display many adaptations to life in terrestrial habitats. Most likely evolved from aquatic algal ancestors (ex. freshwater green algae known as charophyceans) Probably originated from a single common protest ancestor. Ancient relatives of modern day chara or coleochaete (both are complex. Charophycean green algae) probably gave rise to the land plants (embryophytes) In charophyceans a layer of a durable polymer called sporopollenin prevents exposed sygotes from drying out. The accumulation of traits that facilitated survival on land may have opened the way to its colonization by plants. 10 plant phyla: grouped in 3, 2, 5, 1. The rest: lycophytes, pteridophytes, cycads, ginkgos, conifers, gnetophytes,
