1. Natural Selection
Friday, January 16th, 2014

2. Do Now Finish worksheet from class
I have checked 3 homeworks including today
Creating a dichotomous key
Taxonomy web
Today’s HW
Do Now
Take out homework
What biome is Tennessee in?
How do you know?
What is the ultimate goal for all living organisms?

3. Objectives
SWBAT describe natural selection by using Darwin’s 5 key points.
Essential Question
How and why do populations change over time?

4. Vocabulary Natural Selection
Process by which individuals that are better adapted to their environment to survive and reproduce more successfully than less well adapted individuals.

5. Notes – Natural Selection
Over many generations, heritable, adaptable characteristics become more common in a population. This process is called natural selection
There are variations within species. Variations are when individuals of the same species are different from others in some of their traits.

6. Charles Darwin English naturalist
Best known for contributions to evolutionary theory
5 points
Populations have variation
Some variations are favorable
More offspring are produced than survive
Those that survive have favorable traits
A population will change over time

7. Scenarios Apply Darwin’s 5 points to both statements
The picture to the right shows
3 fully grown Giraffes. The
longer necks are selected and
passed on to future generations.
Populations have variation
Some variations are favorable
More offspring are produced than survive
Those that survive have favorable traits
A population will change over time

8. Giraffes Populations have variation Some variations are favorable
Long necks vs. Short necks
Some variations are favorable
Long necks are favorable because they can get more food
More offspring are produced than survive
Those that survive have favorable traits
The long necks will survive more often
A population will change over time
Over time, the average length of the Giraffes neck will increase because it is a favorable trait

9. Your turn
The Canadian Lynx and the Arctic Hare have a predator-prey relationship. The average speed of both species has increased over a long period of time.
Populations have variation
Some variations are favorable
More offspring are produced than survive
Those that survive have favorable traits
A population will change over time

10. Worksheet Please work independently You have 10-15 minutes
Be prepared to go over it and share

11. Answer the Essential Question
How and why do populations change over time?

12. Exit Ticket
During a storm, several butterfly eating birds were blown to a distant island. The island, which previously had no birds, was filled with butterflies of all colors. 5 years later, all of the butterflies were either green or brown.
What is the process called when certain populations are better adapted and the others will not survive?
What are Darwin’s 5 key points and how does this scenario apply to the 5 points?