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Adaptations Over Time

Adaptations Over Time. Who was Jean Baptiste de Lamarck?. Hypothesized that traits developed during a parents lifetime are passed to offspring Inheritance of acquired characteristics Ex: large muscles. Larmarck. Who was Charles Darwin?. Theory of Natural Selection

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Adaptations Over Time

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  1. Adaptations Over Time

  2. Who was Jean Baptiste de Lamarck? Hypothesized that traits developed during a parents lifetime are passed to offspring Inheritance of acquired characteristics Ex: large muscles Larmarck

  3. Who was Charles Darwin? Theory of Natural Selection Organisms with traits best suited to their environment are more likely to survive and reproduce. Traits are passed to more offspring. Changes take place gradually Darwin

  4. Principles of Natural Selection • Organisms produce more offspring than can survive • differences/variations occur among individuals of a species • Some variations are passed to offspring • Some variations are helpful. Those with helpful variations survive and reproduce better than those without. • Over time, offspring of those with helpful variations make up more of the populations and eventually may become a separate species.

  5. What is a variation? Variation – inherited trait that makes the individual different from others in the species Permanent changes or gene mutations May be helpful or harmful Variation

  6. What is an adaptation? Adaptation – any variation that makes the organism bettered suited to its environment Ex: color, shape, chemical makeup Adaptation

  7. Darwin Lamarck Activity • Elephant activity

  8. How quickly do changes in inherited characteristics take place? Two hypothesis Gradualism model –slow, ongoing process Punctuated equilibrium – rapid evolution The Speed of Evolution

  9. Vocabulary Circles Define in your own words Definition from book Vocabulary word Use the word in a sentence – what does it mean to you? Draw a picture which represents the word

  10. Vocabulary Circles The gene that takes control and shows up if it is there Factor that dominated or covered up the other form dominant People will have blue eyes if they have the dominant gene The Romans dominated the Greeks

  11. Ideas About Evolution • Camouflage activity • Flashy Fish activity – http://www.pbs.org/wgbh/evolution/educators/lesons/leson4/act2.html

  12. What are fossils? Fossils are the preserved remains or traces of an organism that lived in the past. Fossils

  13. What are the different types of fossils? Textbook page 164 Imprint fossils Mineralized/petrified fossils Molds and cast fossils Amber Tar Frozen Most fossils form when organisms die and become buried in sediments Types of fossils

  14. Fossilization Game • Great Fossil Find

  15. What do fossils reveal? • Fossils help scientists piece together information about the Earth’s past. • Millions of fossils collected by scientists are called the fossil record • Fossil record is incomplete – WHY?

  16. What do fossils reveal? • Fossils are used to build models • Footprints give clues to how fast the animal travels and how tall it was • Fossil record gives clues about how and when new groups of organisms evolved

  17. What is the geologic time scale? “Calendar” of the Earth’s history Precambrian Time is the largest span of time First 4 billion year’s of the Earth’s history Few fossils from these ancient times Life’s History

  18. Create a poster of a particular time during the Earth’s history facts about the plants and animals that were alive during the period illustrations showing the landforms and bodies of water that were present. Geologic Time Scale

  19. Fossil Record • Life Has a History web search • Periods 1,3,4 use Level 2 • Periods 2,5 use Level 1

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