What is the driving force of evolution?

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Presentation transcript:

What is the driving force of evolution? (Natural Selection)

How does this relate to the Galapagos Islands?

Galapagos Islands 13 species of finches Resemble one finch from South America One species  13 species? Adapted to various habitats Different beaks = different food (read caption) How did these different beaks arise? Darwin’s theory of NATURAL SELECTION

Natural Selection Natural Selection- The process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species. “Survival of the Fittest”. Variation- Any difference between individuals of the same species.

Natural vs. Artificial Selection Artificial Selection- When humans choose desired traits and breed organisms. Artificial Selection Ex: Breeding dogs. Natural Selection Ex: The Peppered Moths

Review Questions 1. What is an adaptation? How might an adaptation benefit a species? 2. What is variation? 3. What is natural selection? What factors might cause a change in a species over time?