PPT-Natural Selection and Adaptation…54

Theory of Evolution Species adapt or change over time leading to new variations which will result in a new species or the species will become extinct Slow Charles Darwin The Theory of . Evolution. Believed to be 4.5 billion years old. Thought to have had a very anaerobic atmosphere. Earliest organisms were able to survive primitive environments. Prokaryotes that resemble today’s bacteria. Book Study Guide (Assigned Monday 4/6). Answers. Chapter 15. 1. Natural selection is a mechanism for…. EVOLUTION. 2. __________ was used to produce purebred Chihuahuas and cocker spaniels.. ARTIFICIAL . 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.. organisms. in . retrospect. : . complexifying. the . picture. of the . Modenr. . Synthesis. . Philippe Huneman. IHPST (CNRS/Université Paris I Sorbonne). Nowadays. : . two. critiques of the Modern . 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. What is natural selection?. It’s the . process whereby organisms better adapted to their environment tend to survive and produce more offspring. . The . theory. of its action was first fully . explained . Context. : . Introductory biology for science majors . 2 full class periods and a follow-up exam question. Learning Goal. : We want students to understand that natural selection is a phenomenon that applies to their lives. 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…. 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. A. Species overproduce offspring that may survive an environment.. B. There is little variation among members of a population.. C. Competition for resources, mates, and space among species leads to a struggle to survive.. His Case. THINK ABOUT IT . Darwin wrote up a complete draft of his ideas about natural selection, but he put the work aside and didn’t publish it for another 20 years. . Darwin knew that his own theory was just as radical as Lamarck’s, so he wanted to gather as much evidence as he could to support his ideas before he made them public.. For more information on how you can help our environment or to make some suggestions of your own please go to wwwcoolaustraliaorgrealised that the beaks were di31erent depending on local food source F A trait that improves a population’s reproductive success is . an adaptation. .. An individual/population that is . adapted. is successful at producing grandchildren in its environment.. Adaptation. Science. Learning intention. To know what 'natural selection' is and how it works. . You will need. A pen and paper or your laptop to record your answers. . The internet . to access the weblinks on later slides.