Chapter 22

Define the term "species."

Name two types of organism that do not fit easily into the biological species concept. What species concept would work best for these organisms?

Explain how ecological and phylogenetic considerations can help inform whether or not a group of organisms represents a single species.

Name four reproductive barriers and indicate whether each is pre- or post- zygotic.

Describe how genetic divergence and reproductive isolation are related to each other.

Differentiate between allopatric and sympatric speciation, and state which is thought to be more common and why.

Differentiate between allopatric speciation by dispersal and by vicariance, and give an example of each.

Describe how genetic drift can result in speciation.

Describe how natural selection can result in speciation.