The Origin of Species
Campbell Chapter 22
1. Define the term species.
2. Suggest some cases in which the biological species does not work.
3. Why is the phrase "potential to interbreed" included in the biological species concept?
4. Barriers to reproduction fall into the categories of prezygotic and postzygotic barriers. Describe each of the following
a) Prezygotic barriers: prezygotic barriers, habitat isolation, behavioral isolation, temporal isolation, mechanical isolation, gametic isolation
b) Postzygotic barriers: reduced hybrid viablity, reduced hybrid fertility, hybrid breakdown
5. Identify and give an example of the two major types of speciation.
6. What conditions favor allopatric speciation?
7. Many plant species have arisen by sympatric speciation by means of autopolyploidy or allopolyploidy. Explain.
8. Define and explain adaptive radiation. Is there evidence for it?
9. What is adaptive divergence?
10. Explain the differences between punctuated equilibrium and gradualism?
11. Why is it that only inherited changes are important in evolution?