PPT-Evolution and Natural Selection

Testable Hypotheses Use ifthen logic Collect data Reject the null hypothesis Support the hypothesis Devise another test and another and another Darwinian Theory Evolutionary change is inevitable if. 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. The Importance of Evolution in Ecology. Ecologists study proximate or “how” questions:. How nutrients flow through ecosystems. Evolutionary biologists study ultimate or “why” questions:. Why does a stickleback fish have armor in one lake but not another?. The Smallest Unit of Evolution. A common misconception is that organisms evolve during their lifetimes. Natural selection acts on individuals, but only populations evolve. Consider, for example, a population of medium ground finches on Daphne Major Island. A mechanism for change in populations.. Any change in the . inherited . traits within a population across generations. Individuals better adapted to their environment tend to survive and . produce more offspring. Danielle Donahue. Aa. A. daptation: a well fitted feature that aids in the survival of a population. Example: the blind cave salamander has no use for eyes because they live in complete darkness. Bb. 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. is the process of change over time.. Evidence of evolution. . Biogeography. is the study of where organisms live now and where their ancestors lived in the past.. Patterns in the distribution of living and fossil species tell us how modern organisms evolved from their ancestors.. Unit:09. Lesson: 01. Be prepared to share your response to the following:. Biological evolution happens at the __________ level, not the individual organism level.. All three definitions mention genetic changes or changes in allele frequency within a population from one generation to the next.. 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 Early atmosphere, evidence, natural selection and disease agents influence natural selection. . Introduction . Evolution “ simple” definition: change over time. Evolution helps us to understand the history of life.. Chapter 11 Biology Textbook. KEY CONCEPT . Hardy-Weinberg equilibrium provides a framework for understanding how populations evolve.. . Hardy-Weinberg equilibrium describes populations that are not evolving. . Chapter 17: Processes of Evolution. Early Beliefs. 19. th. century: discovered species shared many traits, but lived in different parts of the world. Problematic – species only looked similar on the outside, but inside were very different . . The process by which organism change over time. Based on science, not opinion.. Darwin. :. Evolution is descent with modification. Evolution. :. changes through time. Species accumulate difference.