PPT-Population and Natural Selection

Food Chain Studying Populations Who will survive The Model Coyote Cardboard Eats rabbits Needs to eat two rabbits each round to survive Moves faster to catch enough rabbits Rabbit Bean Eats vegetation rice. Folding the Graphic Organizer. 3. Cut along the dotted lines between each box. . . Stop cutting where the dotted lines end.. Folding the Graphic Organizer. 4. Fold along the red dotted lines shown below so. 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.. Wednesday 1/22/14. Grab a book and a new . bellringer. so you are not TARDY. LT: I can identify types of selection. BR: What is natural selection?. ** if you finish . bellringer. begin & finish vocab for day 2. We will begin class 10 min after bell rings. Day 2 is due on Tuesday. Folding the Graphic Organizer. 3. Cut along the dotted lines between each box. . . Stop cutting where the dotted lines end.. Folding the Graphic Organizer. 4. Fold along the red dotted lines shown below so. Testable Hypotheses. Use if…then… logic. Collect data . Reject the null hypothesis. Support the hypothesis. Devise another test, and another, and another!. Darwinian Theory. Evolutionary change is inevitable if:. 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…. 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.. 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) 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. . 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.