1. Types of Natural Selection

2. Directional selection
One extreme is better
Ex. length of an anteaters tongue

3. Diversifying selection
Opposite extremes are favored
Ex. White shell or Dark shell

4. Stabilizing selection
The average is best
Ex. Field mouse size

5. Types of natural selection

6. Sexual selection
Picking a mate based on secondary sexual characteristics
EX. Tail of peacock

8. Sexual dimorphism Difference in appearance between males and females
Males tend to be more colorful

9. Males tend to be shorter
Ex. Praying mantis

10. Diamond back terrapins
Males smaller

11. Or just weird to us humans

12. More sexual dimorphism

13. Intrasexual selection
Competition between individuals of same sex
Ex. Rams, elephant seals

14. Fight for Harem

15. Inter sexual selection
(mate Choice)
One sex is choosy about selecting mates
Ex Bower bird makes fancy bower to attract mate