1. Do now activity #5
What type of Natural Selection is selecting black rabbits?
What type of Natural Selection is selecting for black AND white rabbits?
What type of Natural Selection is selecting for ONLY brown rabbits?
White
Black
White
Brown
Black
White
Brown
Black
Black
White
White
Brown
Black
Brown
White
Black

2. Section 6-3: speciation Essential Question:
How can an environment cause speciation? How can speciation cause a change in relative frequency?
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 6-3: speciation

3. Don’t forget to chunk your notes!

4. Fitness: having adaptations to help you survive the environment
overview
Fitness: having adaptations to help you survive the environment

5. Fitness: being able to find mates and reproduce to pass on traits
overview
Fitness: being able to find mates and reproduce to pass on traits

6. overview
Some animals are more fit than others because they are better at finding and attracting mates.

7. But there are natural reasons why certain species do not interbreed.
overview
But there are natural reasons why certain species do not interbreed.

8. Don’t forget to chunk your notes!

9. speciation
Speciation happens when new species evolve, and the new populations become reproductively isolated from each other.

10. speciation
________ _____ is when members of two populations cannot breed and produce fertile offspring.
Reproductive
isolation
Reproductive isolation

11. When this happens the populations have different _____ ____.
speciation
When this happens the populations have different _____ ____.
Gene pools
gene
pools

12. Don’t forget to chunk your notes!

13. Reproductive isolation
There are 3 types of reproductive isolation.

14. _____ _____ is when they do different things.
1. Behavioral isolation
_____ _____ is when they do different things.
Behavioral
Isolation

15. 1. Behavioral isolation
This type of isolation is capable of interbreeding but have differences in courtship rituals.

16. 1. Behavioral isolation Examples: Mating Songs Mating Dances
Building nests

18. Don’t forget to chunk your notes!

19. ______ _____ is when organisms are separated from each other.
2. Geographic isolation
______ _____ is when organisms are separated from each other.
Geographic
Isolation
Geographic isolation

20. 2. Geographic isolation For example, populations are separated by:
Bodies of water (rivers, lakes, oceans)
Mountains
Forest or meadow

21. 2. Geographic isolation
Why would squirrels, but not birds, be geographically isolated by a river?

22. These barriers do not always affect birds that can fly over them
2. Geographic isolation
These barriers do not always affect birds that can fly over them

23. Don’t forget to chunk your notes!

24. 3. Temporal isolation
_______ ______ is when two or more species reproduce at different times
Temporal
Isolation
Temporal isolation

25. 3. Temporal isolation
Example: Early Spring vs. Late Spring