1. Darwin’s Evolution A Theory of Evolution

2. How did the giraffe get its long neck ? Lamarck had an idea… Lamarck had an idea… Organisms acquire traits. Organisms acquire traits. Organisms evolve. Organisms evolve. Pass their acquired traits to their offspring. Pass their acquired traits to their offspring.

3. Lamarck Can I “get buff” and then have “buff” kids? Can I “get buff” and then have “buff” kids? Can I study and get really smart and then have genius kids? Can I study and get really smart and then have genius kids?

4. Organisms don’t evolve, species evolve. Organisms don’t evolve, species evolve. Within a population there are variations among organisms. Within a population there are variations among organisms. Genetic Diversity from sexual reproduction and mutations. Genetic Diversity from sexual reproduction and mutations. They are born that way. They are born that way. How did the giraffe get its long neck? DARWIN

5. These different individuals had an advantage over the others in its herd. These different individuals had an advantage over the others in its herd. Survival of the fittest. Survival of the fittest. Organisms don’t adapt, species adapt through natural selection. Organisms don’t adapt, species adapt through natural selection. How did the giraffe get its long neck? Mutant!

6. This mutant has more children than the rest of the population because it is better adapted to the environment. This mutant has more children than the rest of the population because it is better adapted to the environment. The population evolves so that all the individuals become like the mutant. The population evolves so that all the individuals become like the mutant. How did the giraffe get its long neck?

7. Eventually all giraffes have long necks. Eventually all giraffes have long necks. How did the giraffe get its long neck?

8. The Theory of Evolution Organisms within a species have variations. Organisms within a species have variations. Organisms struggle for survival and reproduce at different rates. Organisms struggle for survival and reproduce at different rates. Natural selection – the environment determines which variation is the best. Natural selection – the environment determines which variation is the best. Survival of the fittest - those with the best variation will out survive the ones without it. Survival of the fittest - those with the best variation will out survive the ones without it.

9. Adaptations Organisms born with a unique variation that allows them to survive in an environment. Organisms born with a unique variation that allows them to survive in an environment. Variations that give them an advantage over those who don’t have that variation. Variations that give them an advantage over those who don’t have that variation. Which dog has an adaptation? Which dog has an adaptation?

10. Hand Variation in a Human Population F 101112131415161718192021222324252627 F 00002581213251610530000 F M 1112131415161718192021222324252627 M 00000010381016282511201 M