1. The History of Evolution
Darwin
Lamarck
Cuvier

2. Species lion tiger liger
Species: group of organisms that can interbreed and produce fertile offspring
Different species rarely breed
Interspecies breeding often results in sterile offspring
Ex: Horse x Donkey = Mule
Ex: Lion x Tiger = Liger
When new species? no longer able to reproduce sucessfully
tiger
liger

3. horse
donkey
mule

4. Jean Baptiste de Lamarck
Acquired Inheritance: Early theory where organisms could acquire traits after birth
Problem: Traits acquired after fertilization cannot be passed to offspring
Example: Giraffes & Long Necks
Long necks are result of stretching to reach leaves
Extra length was passed on to offspring

5. Geologic Change Early belief: Earth ~6,000 years old
Life remained unchanged
“New” Observations
Rock layers (strata) contained differing fossils
Deeper fossils less complex
Environments changes as continents drift
Uniformitarianism: geologic processes that shape earth are uniform

6. Charles Darwin Observed:
Organisms vary based upon their environment
Similarities between extinct fossils & modern life
Marine fossils atop mountains
Natural Selection: Process where organisms with favorable traits survive and reproduce
Major concept in biology published in The Origin of Species (1859)

7. Adaptation & Variation
Variation: Inherited traits that make an individual different from others
Green, flat wings of the insect above
Adaptation: Variation increases the chance of survival
Ability to blend with environment

8. Butterflies won't
lay eggs on plants
with fake egg spots

9. Can you find
the geckos?

10. Gross....bird poop...or is it???

11. Review When are two organisms considered a different species?
Even though incorrect, why is Lamarck’s theory still relevant?
How can the general age of rocks (and fossils) be determined?
How does a variation and adaptation differ?
What is natural selection?