PPT-What does natural selection “act on”?

Eg the evolution of pepper spiciness What does natural selection act on the gene the individual the population or group the species They are in you and me they created us body and mind and their preservation is the ultimate rationale for our existence They have come a long way those replicators Now they go by the name of genes and we are their survival machines. 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. 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- 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. . 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. 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:. 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. 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. 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.. 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 . 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 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.. Download PDF The Encyclopedia of Natural Remedies™ eBook by Dr Freddie Masaki - An eBook That Provides Natural Remedies for Treating Various Diseases.