1. Do now activity #3
What is the difference between a variation & adaptation? Give an example of each.
What is the difference between single and polygenic traits?
True/False: Dominant traits always have a high relative frequency.
If #3 was incorrect, please correct it to form an accurate statement.

2. Section 6-2: Gene frequency
Essential Question:
How can the environment impact relative (gene/allele) frequency? Support your explanation with an example.
Learning Target
Justify why an advantageous trait will increase in proportion from one generation to another when provided statistical evidence.
Use data to explain how change in gene frequency caused by natural selection is related to environmental factors such as seasonal temperature, climate change, acidity, light, geographic barriers, & evolution of other organisms.
Section 6-2: Gene frequency

3. Don’t forget to chunk your notes!

4. Relative (gene/allele)
overview
____ _____ is the number of times an allele occurs in the gene pool.
Relative (gene/allele)
frequency
Relative Frequency
Evolution (genetic terms): any change in the relative frequency of alleles in a population

5. overview
Genetic drift is a random change in relative frequency because of chance.

6. In small populations, there can be more or less of an allele just by chance.
Examples:
Natural disasters
Alleles passed on are random
overview
Remember, the smaller the group the less likely it will reflect the laws of probability
Ex: coin toss

7. Don’t forget to chunk your notes!

8. Natural selection ICE AGE
Directional Selection can be caused when nature is against one end of variation.
Example:
ICE AGE

9. Natural selection DROUGHT
Stabilizing Selection can be caused when nature is against both ends of variation.
Example:
DROUGHT

10. Disruptive Selection can be caused when nature is against the most common variation.
Natural selection
Example:
BROWN FUR COAT INDUSTRY

11. Don’t forget to chunk your notes!

12. Founder effect
Founder effect is when relative frequencies change because a small group of the population moves away.
The new place has…
a) MORE VARIATION
b) LESS VARIATION
c) SAME AMOUNT OF VARIATION
cyclins
The new island has…
a) MORE VARIATION
b) LESS VARIATION
c) SAME AMOUNT OF VARIATION

13. Founder effect
If, by chance, an individual with a specific allele can reproduce a lot, then there will be more of the allele in the population.
cyclins

14. Don’t forget to chunk your notes!

15. Sample of Original Population
examples
Sample of Original Population

16. Sample of Original Population
examples
Founding Population A
Sample of Original Population
Founding Population B

17. Sample of Original Population
The new place has…
a) MORE VARIATION
b) LESS VARIATION
c) SAME AMOUNT OF VARIATION
examples
Founding Population A
Sample of Original Population
Descendants
Founding Population B

18. Do now activity #4 How is the picture an example of genetic drift?
How is the picture an example of Founders Effect?
Genetic drift because the relative frequency changed from mutation at 4.5% to 20% to 41% (Total is 22) because of earthquake/death/etc.
Founders because Small group moved away so relative frequency of original population went from 4.5% to 0% mutation