PPT-Year 10 Lesson 4 – natural selection

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. 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. Evolution: Teachable Tidbit. 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. G7- I can list examples of changes in genetic traits due to natural and manmade influences. What is Natural Selection?. Write it on your white board. Which of the following is an example of Natural Selection?. 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.. 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. Modern Theory of Evolution) . Review Questions. What structure does this picture represent?. Answer: Homologous Traits . What is an adaptation?. A) . A test for natural selection . B) . A. . physical or behavioral characteristic that has developed to allow an organism to better survive in its environment. According to evolutionists. Characteristics of Organisms in the Galapagos Islands compared to nearby South America. Darwin hypothesized that animals came to the . Galapagos. from the . mainland. and they became . 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.. Spring Feb 2015 . Gene Frequency . Random . g. enetic mutations occurs. Inherent. Variation . Sexual reproduction. . Relationship between Gene Frequency and Natural . S. election. Natural Selection. 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