Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Evolution by Selection Natural: Environment selects for fittest traits Artificial: Humans select for desired traits Teosinte Zea mexicana Artificial selection Corn Zea mays Genetic Drift: changes in gene frequency happen by chance Freq. 14/20 = 0.7 6/20 = 0.3 v River Genetic Drift: changes in gene frequency happen by chance Freq. 1/10 = 0.1 River 9/10 = 0.9 v Freq. 5/10 = 0.5 5/10 = 0.5 Homology: similarity of the structure, physiology, or development of different species of organisms based upon their descent from a common evolutionary ancestor Analogy: a functional similarity of structure based not upon common evolutionary origins but upon mere similarity of use Homology Common ancestor had same feature Humerus, radius, ulna, carpals, metacarpals, phalanges Analogy No known Common ancestor