1) Explain how a phenotype can increase, decrease, or have no effect on a organisms fitness

1) Explain how a phenotype can increase, decrease, or have no effect on a organisms fitness.

2) Explain what would happen if a particular hair color suddenly gave an advantage under existing environmental conditions.

3) What components in an environment may be different on either side of the barrier?

4) What does the term "reproductive isolation" refer to?

5) Can you hypothesize how three organisms can have similar structures, yet they serve different function?

6) It would seem that wisdom teeth no longer serve a purpose. Can you propose what purpose they served earlier in our evolution?

7) Explain why the pharyngeal slit becomes the Eustachian tube in humans and a gill in fish.

8) Mammals and prokaryotes use DNA as the molecule of heredity. What does this imply?