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Biology 1104k Plant Evolution Notes

by: Logan Barnes

Biology 1104k Plant Evolution Notes Bio 1104k

Marketplace > Georgia State University > Biology > Bio 1104k > Biology 1104k Plant Evolution Notes
Logan Barnes
GPA 4.19

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About this Document

Notes on ch 19-- plant evolution. Will be on the test/study guide
Introductory Biology II
Dr. Chapman
Class Notes
Biology 1104K, plants, Plant Evolution, notes
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This 2 page Class Notes was uploaded by Logan Barnes on Saturday January 30, 2016. The Class Notes belongs to Bio 1104k at Georgia State University taught by Dr. Chapman in Spring 2016. Since its upload, it has received 26 views. For similar materials see Introductory Biology II in Biology at Georgia State University.


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Date Created: 01/30/16
Plant Evolution—Ch. 21 Plants  All plants have following characteristics: o Plantae kingdom o Multicellular o Photosynthesize for nutritition o Have embryos o Have alternation of generations o Very diverse o Adapted to life on land  A ‘plant’ spands from duckweed on a pond’s surface to a California Redwood  Majority of plants that are discussed in biology are autotrophs  Plants—VERY IMPORTANT: Alternation of generations o Alternation of generations=a multicellular diploid generation alternates with a multicellular haploid generation  Haploid—1n, one copy of chromosome  Diploid—2n, 2 copies of chromosomes  All land plants have a life cycle w/ alternation of generations  Ex of alternation of generations: (note: it is a life cycle) o Moss starts our as a single haploid spore o It then goes through a process to become a multicellular haploid gametophyte—(Fertilization) o Leads to swimming sperm/egg—the gametes. Which come together to form zygote o Grows to become diploidic, multicellular sporophyte—Mitosis o Then lets out a single cell, haploidic spore, thus restarting the cycle—Meiosis  Mitosis—diploid cell and leads to identical diploid cells—diploid to diploid  Meiosis—Diploid cell and leads to 2-4 haploid cells: Diploid to haploid  Fertilization—2 Haploid cells come together to form a diploid cell— Haploid to diploid Plant Evolution  Green Algae is thought to be the ancestor of land plants o Lived in water, evolution led to plants moving to land  Algae had to evolve due to predation in the waters they lived in, along with too much competition  Land plants had to deal with some issues when first transitioning to living on land: o Gravity—get water from ground into cells and throughout the system, keep the water in the system and not dry out  Waxy cuticle came to be to keep water/moisture within the plants system  Stomata also a trait that come to be over time in order to exchange gasses o Sunlight—plants can burn from UV radiation, which wasn’t an issue when it was algae in water (as water reflects UV radiation)  Pigments was a trait plants evolved to avoid this issue


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