1. Types of Selection (Stabilizing, Directional, Disruptive)

2. Natural Selection Animals adapting to environment Advantaged animals survive and reproduce

3. Stabilizing Selection Most Common Average survives

4. Stabilizing Selection Examples: Short flowers die: No sunlight Medium flowers live: Perfect conditions Tall Flowers die: Wind damage Lightweight babies have higher mortality rate: weaker Average weight babies survive more often: healthy Heavyweight babies have higher mortality rate: when being born

5. Directional Selection One extreme trait is favoured

6. Directional Selection Examples… A long time ago… Short neck giraffes died: could not reach leaves on tree Medium neck giraffes died: could not reach leaves on tree Long neck giraffes prospered: leaves were reachable A long time ago… Small horses died: very disadvantageous Medium horses died: disadvantageous Large horses prospered: advantageous

7. Disruptive Selection Opposite extreme traits are favoured Average trait is eliminated

8. Disruptive Selection Examples… In an environment with black and white rocks… White rabbit lives: Camouflaged Grey rabbit dies: Seen by predator Black rabbit lives: Camouflaged In an environment with deep and shallow flowers… Short beak hummingbird lives: can get pollen from flower Medium beak hummingbird dies: cannot get pollen from flower Long beak hummingbird lives: can get pollen from flower

9. Video on Types of Selection

11. Works Cited