PPT-Natural Selection

Anim A l ADAPTATIONS What is natural selection This is the idea that a specific physical trait of a population made it more likely to survive the given environment Some researchers believe that language was created in order to help humans survive A group of hunters communicating to become more effective is one example of how this could happen If a species lacks a certain trait that will allow it to survive there are two options Either the . Change over time…. Geology. Began to study rock layers called strata. George Cuvier. Studied fossils. Found extinct species and noticed the deeper the fossil the more unique. Catastrophism. Charles Lyell. Concept 51.5 . Nia. Sanders . Foraging Behavior . Optimal foraging theory- views foraging behavior as a compromise between the benefits of nutrition and the costs of obtaining food . Natural selection should favor foraging behavior that minimizes cost and maximizes benefits . 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. 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. 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. 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. . 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.. Hasan. Mahmud. Natural Selection . Is the basis of the other types of selection. Competition Variation. Heriatble. Difference in survival. Relaxed and Artificial Selection are simply natural selection under different . 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..