PPT-Genetic Frequency & Natural Selection Project

Golden Girls Plus Alex Media Room B Group Presentation Date 140523 Presenters Alex Bentley 288531 Nancy Bocanegra 320379 Cathy Odom 128180 . Genetic Drift (and Inbreeding). DEVIATION. . from . Hardy-Weinberg Equilibrium. Indicates that . EVOLUTION. Is happening. 4 Major Evolutionary Mechanisms that alter allele frequencies in populations:. Evolution- changes in the characteristics of groups of organisms over time . Charles Darwin was the first to propose a feasible . mechanism. for evolution. It is called . natural selection. . . Evolution by Natural Selection is a theory. . 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.. A) Directional selection. Chance events . Stabilizing selection . Disruptive selection. Answer Key – LO 1.2. Directional selection is most common wen a population’s environment changes or when members of a population migrate to a new habitat with different environmental conditions than their former one. Stabilizing selection acts against extreme phenotypes and favors intermediates variants. Disruptive selection occurs when environmental conditions favor individuals on both extremes of a phenotypic range over intermediate phenotypes. An example of directional selection is that black bears in Europe increase with size during the colder weather, only to decrease during the warmer weather. An example of stabilizing selection is the birth weights of most human babies lie in the range of 3-4 kg; babies who are much smaller or larger suffer higher rates of mortality. An example of disruptive selections is black- bellied seed cracker finches have two different beak sizes for cracking different types of seeds. . variation and fitness. Hardy Weinberg law. Assume a . gene . with two . alleles. A and B that occur with frequency p and q = 1-p. . What is the frequency after crossing?. According to the Hardy Weinberg law gene frequencies are constant.. The Smallest Unit of Evolution. A common misconception is that organisms evolve during their lifetimes. Natural selection acts on individuals, but only populations evolve. Consider, for example, a population of medium ground finches on Daphne Major Island. Introduction. How genetic selection works. Gains due to genetic selection. Use of genomic technology. Future research opportunities. How does genetic selection work?. ΔG = . genetic gain each year. reliability =. Motivation. Most powerful mode of evolution. Explains observation of Descent with Modification. Nonrandom survivorship/reproduction of individuals based on particular features of their phenotype. . Any environmental agent may be the cause of natural selection. Golden Girls Plus Alex Media Room B Group. Presentation Date: 140523. Presenters: Alex Bentley. . 288531. Nancy . Bocanegra. 320379. Cathy Odom 128180. . Evolutionary Ideas. A. lthough Darwin is given much credit for evolutionary theory, he was not the first person to come up with the idea.. Evolution is the change in a population over time.. The concept of evolution had been discussed for more than 100 years prior to Darwin’s theory.. Spring Feb 2015 . Gene Frequency . Random . g. enetic mutations occurs. Inherent. Variation . Sexual reproduction. . Relationship between Gene Frequency and Natural . S. election. Natural Selection. Recent Evolution in Humans. Evolution is very much still happening today — and it's happening to us.. Right here, right now.. Our genes constantly change over time thanks to the power of selection.. 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.