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How Does Evolution Happen?

How Does Evolution Happen?. Chapter 10, section 2. Charles Darwin. Let’s read a little background on Charles Darwin… See pages 306-307 List 5 important facts about Darwin’s life. Ideas about Breeding. Trait = form of an inherited characteristic

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How Does Evolution Happen?

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  1. How Does Evolution Happen? Chapter 10, section 2

  2. Charles Darwin • Let’s read a little background on Charles Darwin… • See pages 306-307 • List 5 important facts about Darwin’s life

  3. Ideas about Breeding • Trait = form of an inherited characteristic • Selective Breeding = humans choose plants or animals for breeding based on a desired trait

  4. Ideas about Population • Species can produce many offspring but only those with enough resources (food, water, etc.) will survive long enough to reproduce • Those with traits that help them survive will pass on those helpful traits to their offspring

  5. Ideas about Earth’s History • The Earth is very old and therefore there has been plenty of time for an organism to change slowly over time.

  6. Darwin’s Theory of Natural Selection • Evolution happens by natural selection • Natural selection = The process by which organisms with favorable traits survive and reproduce at a higher rate than organisms without the favorable trait

  7. 4 steps to Natural Selection • Overproduction = more offspring are born than can survive • Inherited Variation = each individual has its own set of traits (some favorable, some not) • Struggle to Survive = Only some individuals live long enough to reproduce • Successful Reproduction = Those best adapted reproduce and have offspring that survive

  8. Natural Selection Example(pg. 310)

  9. What Darwin didn’t Know… • Darwin was unaware of the “how”: • Research has given us more information • DNA (Watson and Crick) • Genetics (Gregor Mendel)

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