1. Evolution
Change Over Time

2. Your Turn
Look at the picture and create your own definition of evolution

3. EVOLUTION:
The diversity among living organisms is a result of evolution
If organisms do not evolve they will become extinct

4. Theories of Evolution - Lamarck
Jean Baptiste de Lamarck ( )

5. Theories of Evolution – Lamark
Believed that species have changed over time for the purpose of adaptation
Use and disuse
Structures grew or shrank based on how much they were used
Transmission of acquired traits
Parents could transmit the characteristics acquired through use and disuse directly to their offspring

6. Your Turn
Based on Lamarck’s theory describe why the giraffes had long or short necks and how that affected their offspring.

7. Your Turn Weisman Experiment: He bred 2 mice who’s tails he had cut.
The offspring all had long tails.
DOES THIS EXPERIMENT SUPPORT LAMARCK’S THEORY? EXPLAIN.

8. Theories of Evolution - Lamarck
Lamarck’s theory was proven to be incorrect
Weisman’s rat experiment

9. Theories of Evolution - Darwin
Charles Darwin ( )

10. Theories of Evolution - Darwin
Newer forms appearing in the fossil record are the modified descendants of older species
ALL species descended from one or a few original types of life
Evolution occurs as a result of natural selection

11. Theories of Evolution - Darwin
Individuals with favorable adaptations or traits would survive and reproduce more successfully than individuals without these favorable traits
Survival of the fittest
Does not mean strength

12. Your Turn
Look at the following cartoons. Pick one and create your own definition of survival of the fittest and natural selection

13. Darwin developed his theory while working as a naturalist on the HMS Beagle (1831)…
Darwin noticed:
Variations existed among individuals in a species
Individuals will compete for resources like food and space
Competition would lead to the death of some individuals while others would survive
Individuals that had the favorable variations were more likely to survive and reproduce
Darwin’s finches

15. Industrial Melanism
The adaptation of a population by the darkening of its individuals in response to industrial pollution.
An example of human impact on Natural Selection.
Peppered Moths (Biston betularia) in Manchester England from 1845 to 1890 (industrial revolution).
Before industrial revolution trees covered with lichens (light grey color)
During industrial revolution trees covered with soot
How could this affect the Peppered Moth?

16. Before Industrial Revolution
How many moths do you see?
Who is better adapted to the environment?
Why?

17. During Industrial Revolution
Now how many moths do you see?
Who is better adapted to the environment?
Why?