Lecture 8- plant evolution

Lecture 8- plant evolution - Lecture 8: Plant Evolution...

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Lecture 8: Plant Evolution 2/25/08 Plant evolution: different plants have different ploidy for the different parts of their lifecycle…plants in same group should have more traits/DNA in common than individuals in other groups Earliest plants that evolved- most of their life cycle is haploid, small diploid part Plants that evolved more recently- most of life cycle diploid, small haploid part Being diploid doesn’t protect plant from UV radiation, but extra version of gene can replace damaged gene…increase in amount of diploid cells in different plants as they evolve, more plants being diploid Extant Terrestrial Plants: o Plants that still exist= extant, still around. o Even though dif. Types of plants evolve with dif characteristics, it doesn’t mean the earlier plants that already existed completely go extinct. From these exps of plants still around w/characteristics of plants from the past. o Moss: only a few inches tall, one of first types of plants able to grow on land…not very big. o Extant early terrestrial plants: still have characteristics that exist today Could not transport water over long distances Multicellular, photosynthetic, live a few inches off the ground Could not grow tall, lacked support Needed water for reproduction (another limitation) Water= underground, needs to be extracted in plant and moved upwards, no system to move water very far. .only between cells.
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This note was uploaded on 08/09/2008 for the course BIO 311D taught by Professor Reichler during the Spring '08 term at University of Texas.

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Lecture 8- plant evolution - Lecture 8: Plant Evolution...

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