Write out a short answer to the following questions.

1		Provide an example of a trait that is not simply governed by a single dominant/recessive allele.
2		Why does the HbS allele persist if it is linked to such a fatal childhood illness as sickle-cell anemia?
3		What are the four mechanisms of genetic evolution and how do they function?
4		Why is the difference between microevolution and macroevolution hard to distinguish?
5		Give an example of how punctuated equilibrium would work.