1. I can explain how natural selection causes changes within a population
EVOLUTION:
Change over time
Driven by natural selection

2. NATURAL SELECTION: organisms more fit for their environment will survive and reproduce

3. Why does this discovery worry scientists?
DRIVING FACTORS OF NATURAL SELECTION
Variation: individuals are unique (looks, behavior, etc.)
- More variation = better chance of survival
Scientists have discovered that cheetahs have identical immune systems.
Why does this discovery worry scientists?

4. Which sea turtles do you think will survive?
Overproduction: more offspring born than will survive
Environmental Pressures: competition for food, mates, etc. Hide from predators, climate change
Struggle for EXISTENCE!
Sea turtles lay over 100 eggs at a time! They must quickly make it to the ocean before they get eaten.
Which sea turtles do you think will survive?

5. Selection: Survival of the “fittest”
more fit = selected FOR less fit = selected AGAINST
Generations later

6. ARTIFICIAL SELECTION  selective breeding
Humans PURPOSELY reproduce desirable traits