Evolution and Natural Selection Name: ______

Evolution and Natural Selection Name: ______BS108-Fall 2010 1. The bones of vertebrate forelimbs are similar because of descent from a common ancestor. These forelimbs can be called ______structures.

2. When remains of an organism become suspended in fossilized plant sap, it is called ______.

3. Two closely related species that fail to recognize the courtship behavior of each other are said to be ______isolated.

4. Bats, pterosaurs, and birds are examples of ______evolution.

5. A human example of stabilizing selection is ______.

6. When a few survivors of an original population give rise to the next generation of individuals, the genetic sample is small, a phenomenon called a ______.

7. The human appendix is an example of a ______organ, reflecting our evolutionary past.

8. ______isolating mechanisms include improper development of hybrids and failure of hybrids to become established in nature.

9. ______isolating mechanisms lead to reproductive isolation by preventing the formation of hybrid zygotes.

10. The hypothesis that suggests changes occur gradually through time, as evidenced by the fossil record, is called ______.

11. A ______is a separate group of organisms incapable of interbreeding with other such groups.

12. In the Hardy-Weinberg equation p2 +2pq + q2, describe what each genotype is represented by each member of the equation.

13. What is the process of natural selection?

14. Give an example of behavioral isolation.

15. What does the fossil record tell us?

16. Give two examples of nonrandom mating.