1. Natural Selection
Day 2

2. Opener Sit by your name tag
Open up your Cornell notes from the reading and videos
Get a chromebook
Password is: Pps###### (must be a capital P, followed by their 6 digit student number)
To change password go to:
One capital letter
One lowercase letter
One number
Minimum of 8 characters
One special character (* ! . $ etc)
WHEN DONE: Go to Google Classroom… wait for instruction

3. Agenda Reading Comp 1 12:45 get textbooks
Start artificial selection lab
Natural selection lecture
Homework

4. Homework

5. Homework: section 22.3 Crockapbio.weebly.com
Essential Question: What evidence is there to document the pattern of evolution and how it works?
Read pages and take Cornell notes to answer the essential question
Model this for the class

6. Reading Comp 1 Classroom Code: rd481i Click on Reading Comp 1
Answer the questions using your notes but not your neighbor!
Turn in when done
Return Chromebook
15 minutes

7. Lab Set Up

8. What happened?

9. Evolution! Artificial Selection Natural Selection mimics
And both lead to. . .
Evolution!

10. Brassica rapa

12. Purpose Plant Brasscia rapa seeds
Select a plants in first generation, based on how those plants express a SPECIFIC TRAIT.
Allow ONLY those plants to reproduce and produce seeds
Plant new seeds
Observe second generation
Determine if trait has “spread” in second generation
Analyze data graphically and statistically to determine if results are “meaningful”
Describe your conclusions in writing and demonstrate your understanding of the concept of the idea of “selection”

13. Growing System Watch demo how to set up a “growing system”
Collect materials:
Seeds
Soil
Fertilizer
String
Name tag
Set up growing system
Place growing systems in light boxes
Clean up your mess!!!!
20 minutes

14. Unit One Learning Target #1
I can explain how natural selection works as the major mechanism for evolution

15. Cornell Notes Repetitions!!!
Going to lecture more on Natural Selection. Either
Add to your existing notes
Take more brief notes
Listen and go over the slides more on your own time

16. Scientists knew that. . . The Earth was probably really old
BIG changes could happen VERY SLOWLY over long periods of time (geology)
These facts lead people to propose that things changed darwin is responsible for figuring out the cause… natural selection

18. Natural Selection
Darwin proposed a CAUSE for evolution: Natural Selection
NS based on these facts:
Resources are limited
Organisms produce more offspring then the environment can support
Variation in heritable traits exists in populations
In a population, what are two sources of variation? Why is this variation important for natural selection?
Mutations and reproduction

19. How does it work?
What is the connection between the environment and fitness in natural selection?
Darwin proposed the following:
Certain traits provide an survival advantage: fitness
The survival advantage of a trait depends on the environment
IN SHORT: ENVIRONMENT DETERMINES FITNESS
Individuals with greater fitness have more offspring
Traits that result in fitness are passed on to offspring

20. How it works, cont.
Big Picture: over time, traits that increase fitness will accumulate in a population
Result: EVOLUTION
Gene pool changed
Population adapted to its environment
TIME + LOTS SELECTION = NEW SPECIES