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Evolution/Natural Selection

Evolution/Natural Selection Individual organisms differ and some variation can be inherited (fitness). Fitness is the ability of an organism to survive and reproduce. Organisms produce more offspring than can survive. Compete for limited resources. Survival of the Fittest

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Evolution/Natural Selection

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  1. Evolution/Natural Selection • Individual organisms differ and some variation can be inherited (fitness). • Fitness is the ability of an organism to survive and reproduce. • Organisms produce more offspring than can survive. • Compete for limited resources. • Survival of the Fittest • Organisms that survive pass their traits on to the next generation.

  2. Evolution Over time natural selection results in changes in the inherited characteristics of a population.

  3. Click on the link below to play the video. Natural_Selection__Adaptations__and_Environmental_Changes.asf

  4. http://www.explorelearning.com/Gizmo lab Natural Selection You may use another version of a Peppered Moth Lab.

  5. SPECIATION • Natural selection and chance events can change the relative frequencies of alleles in a population and result in the formation of a new species.

  6. DIVERSITY • Natural Selection leads to a wide variety of species. • Darwin observed that the characteristics of many animals and plants varied noticeably among the different islands of the Galapágos. • Galapágos island Finches are a good example of diversity.

  7. PHYLOGENY • The study of evolutionary relationships among organisms. • Biologists now group organisms into categories that represent lines of evolutionary descent.

  8. ADAPTATION • Inherited characteristic that increases an organism’s chance of survival. • Survival of the fittest.

  9. Behavior • The way an organism reacts to changes in its internal condition or external environment.

  10. EXTINCTION • The disappearance of a species from all parts of its geographical range. • Example: Dinosaurs

  11. Questions on Natural Selection/Evolution 1.The competition between members of a species for basic needs such as food and living space is called— A.     Survival of the fittest B.     Fitness C.     Adaptation D.     Variation

  12. 2. An inherited characteristic that increases an organism's chance of survival is known as a (an)— F.      Adaptation G.     Dominant trait H.     Vestigial organ J.       Evolution

  13. 3. The ability of an organism to survive and reproduce in its environment is called A.     Artificial Selection B.     Natural Selection C.    Selective Use D.     Fitness

  14. 4. Which of the following is NOT part of Darwin’s theory of evolution? F. Struggle for existence G. Inheritance of acquired characteristics H. Descent with modification J. Survival of the fittest

  15. 5. Fitness is a result of • Adaptations • Homologies • Common descent • Variation

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