Evolution by Natural Selection
Evolution by Natural Selection Bio 180
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This 1 page Class Notes was uploaded by Cissy Ding on Tuesday October 6, 2015. The Class Notes belongs to Bio 180 at University of Washington taught by Scott Rider Freeman in Fall 2015. Since its upload, it has received 26 views. For similar materials see Intro Biology in Biology at University of Washington.
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Date Created: 10/06/15
105 Friday October 2 2 15 253 816 PM Darwin recognized a process called natural selection that explains why the pattern of descent with modification occurs ARTIFICIAL SELECTION manipulation of composition of population Darwin39s process of evolution into four simple postulates criteria 0 Individual organisms that make up a population vary in the traits they possess such as shape and size 0 Some of the trait differences are heritable passed on O In each generation more offspring are produced can possibly survive Only some will survive to produce offspring and among those some will produce more than others 0 The subset of individuals that survive best and produce the most is not a random sample of the population Instead individuals with certain heritable traits are more likely to survive and reproduce Natural selection occurs when they produce more offspring than those without certain characteristics selected naturally by environment Evolution by natural selection occurs when heritable variation leads to differential reproductive success BIOLOGICAL FITNESS is the ability of an individual to produce surviving fertile offspring relative to that ability in other individuals in the population ADAPTATION is a heritable trait that increases the fitness of an individual in a particular environment relative to individuals lacking the trait Increase fitness SELECTION is a passive process differential reproduction as a result of heritable variation 254 Theory of evolution by natural selection is testable Natural selection acts on individuals because individuals experience differential reproductive success Only populations evolve Allele frequencies change in populations not in individuals Multidrug resistance NATURAL EXPERIMENT allow researchers to compare treatment groups created by an unplanned change in conditions Natural selection leads to measurable changes in characteristics of population B10 180 Page 1
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