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Week 4 Env Sci Notes

by: Brittney Tilghman

Week 4 Env Sci Notes Esc 1510

Brittney Tilghman

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About this Document

These were the last little bit of notes prior to Exam 1.
Environmental Science 2
Dr. Bradley Reynolds
Class Notes
natural selection, evolution
25 ?




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This 1 page Class Notes was uploaded by Brittney Tilghman on Tuesday September 20, 2016. The Class Notes belongs to Esc 1510 at University of Tennessee - Chattanooga taught by Dr. Bradley Reynolds in Fall 2016. Since its upload, it has received 7 views.

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Date Created: 09/20/16
Week 4 Notes (Exam 1 material)  Alleles: alternate forms of genes - genes are made of DNA - genes are found on chromosomes - genes are inherited - genes produce recognizable traits  Population: group of individuals that mate with one another and produce offspring. - Individuals DO NOT evolve  Micro- vs. Macroevolution - Micro: small scale changes, over few generations - Macro: big scale changes, over long period of time  Descent of Modification ** Darwin did not use the term “evolution” 1. Species alive today descended from ancestral species. 2. Natural Selection is the mechanism for evolution  How does Natural Selection work? - Organisms have excessive numbers of offspring - Resources are limited - Competition results - The young that survive possess natural inherent variation that gives them an advantage. - They survive and reproduce with other survivors - They pass the favorable variation on to the next generation - The next generation improves adaptively over the preceding generation - Result of natural selection o The traits that are best suited to the environment become more common within a population ** These are notes from the Tuesday before our exam.


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