1. AP Biology Speciation Modes

2. AP Biology *Speciation can take place with or without geographic isolation *Reproductive isolation prevents gene flow between populations, and eventually populations become distinct species.

3. AP Biology Allopatric speciation * Can lead to reproductive isolation  Populations geographically isolated

4. AP Biology Sympatric Speciation  Speciation is occurring in populations in same geographic area  How does this happen?  Polyploidy  Habitat differentiation  Sexual selection

5. AP Biology Polyploidy  Extra sets of chromosomes

6. AP Biology Habitat Differentiation  Use habitat differently  Ex. Fish population with some individuals using bottom and other fish using the top area

7. AP Biology Sexual Selection