1 / 15

The Modern Theory of Evolution

The Modern Theory of Evolution. Mr. Modafferi. Do Now. What did Lamarck believe?. Darwin’s Journey. The Galapagos Islands. Volcanic islands off the South American coast Island species varied from the mainland species, and from island-to-island

hausmann
Télécharger la présentation

The Modern Theory of Evolution

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Modern Theory of Evolution Mr. Modafferi

  2. Do Now • What did Lamarck believe?

  3. Darwin’s Journey

  4. The Galapagos Islands • Volcanic islands off the South American coast • Island species varied from the mainland species, and from island-to-island • Example: Each island had either long or short necked tortoises depending on the island’s vegetation (Their shells also varied)

  5. Finches! • Finches on the Galapagos Islands resembled a mainland finch, but there were more types • Bill shapes are adaptations to different means of gathering food. • Galapagos finch species varied by nesting site, beak size, and eating habits.

  6. Think BIGGER! • Newer species are just descendants of older species GEICO Cave Man Mr. Modafferi

  7. Why are there different species? • Darwin believes that once the organisms got to the island they reproduced, and eventually their offspring became different than the original mainland animals • Evolution is linked to genes that are passed on through reproduction!

  8. Adaptation • Adaptation - is a trait that helps an organism be more suited to its environment

  9. How and When do These Changes/Adaptations Occur • Evolutionary changes occur over time • Evolutionary change only occurs in the genes of sex cells • Adaptations can be in structure, function, and behavior over time

  10. Question of the Day • Why do you think a species would change? • Why are there different turtles on the Galapagos Islands? • Why are there different Finches on South America and the Galapagos Islands?

  11. Natural Selection • Natural Selection = Survival of the Fittest • This is the major idea to the modern theory of evolution

  12. Natural Selection Cont. • The environment acts as the selecting agent • Natural occurring variations among members of a population make some of them better adapted to the environment to survive.

  13. Homework • Finish Worksheet

More Related