PPT-Gene Frequency and Natural Selection

Spring Feb 2015 Gene Frequency Random g enetic mutations occurs Inherent Variation Sexual reproduction Relationship between Gene Frequency and Natural S election Natural Selection. and Evolution. DNA and Heredity . As seen in the section on Taxonomy, modern classification of organisms is being shaped by our understanding of genetics; of DNA.. DNA is a polymer (many molecules attached to one another) of nucleic acids. A nucleic acid is monomer (one molecule) that contains three parts:. Relative fitness in relation to. Natural selection. Natural selection often has “survival of the fittest” and the “struggle to survive” associated with it, but it doesn’t necessarily mean direct physical conflict between two organisms.. Natural Selection does not always proceed in the expected direction, because several forces could interfere with the action of Natural Selection. Constraints on Natural Selection. Genetic . Variation. Directional selection on allele frequency. Selections alters the allele frequency of the pop.. FF has highest fitness. SS has lowest fitness. The rate of change in allele frequency is determined by the strength of selection (i.e., the fitness differential of the phenotypes). SC.912.L.151. SC.912.L.15.10. SC.912.N.1.3. SC.912.N.2.1. SC.912.L.15.8. Survival of the Sneakiest. Roles:. Boy/narrator (B). Girl (G). Sound effect person (SE). Male cricket 1 STRONG, ATTRACTIVE, SINGING (MC1). Question? . Is the unit of evolution the . individual. or the . population?. Answer = while evolution effects individuals, it can only be tracked through time by looking at populations. So what do we study? . Question? . Is the unit of evolution the . individual. or the . population?. Answer = while evolution effects individuals, it can only be tracked through time by looking at populations. So what do we study? . 3 Mechanisms for selection and an introduction to . Hardy-Weinberg. Lyell’s Influence. In attempt to . explain the past in terms of present day processes. , Darwin went to local farmers and animal breeders and observed…. Golden Girls Plus Alex Media Room B Group. Presentation Date: 140523. Presenters: Alex Bentley. . 288531. Nancy . Bocanegra. 320379. Cathy Odom 128180. . Golden Girls Plus Alex Media Room B Group. Presentation Date: 140523. Presenters: Alex Bentley. . 288531. Nancy . Bocanegra. 320379. Cathy Odom 128180. . The Scale of . Evolution. Microevolution. Microevolution . occurs over a relatively short period of time within a population or species. The Grants observed this level of evolution in Darwin’s finches which will be discussed later in this lesson.. wallace. and was explained in book “ on the origin of species by means of Natural Selection . . Darwin put the theory based on his observations as he travelled round the world on the ship Beagle.. 4. Population and Evolutionary Genetics. lachance.joseph@gmail.com. https://. popgen.gatech.edu. /. COMT. (. catechol-O-methyltransferase. ) and test-taking anxiety. What is wrong with this claim?. Case Study #1. D. arwinian view of Life. Evolution of Populations. Origin of Species. 10/26 Obj. TSW explain how selection works in a variety of ways using examples and they will do the bird beak lab to demonstrate understanding..