<p>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.</p><p>2. When remains of an organism become suspended in fossilized plant sap, it is called ______. </p><p>3. Two closely related species that fail to recognize the courtship behavior of each other are said to be ______isolated. </p><p>4. Bats, pterosaurs, and birds are examples of ______evolution. </p><p>5. A human example of stabilizing selection is ______. </p><p>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 ______. </p><p>7. The human appendix is an example of a ______organ, reflecting our evolutionary past. </p><p>8. ______isolating mechanisms include improper development of hybrids and failure of hybrids to become established in nature. </p><p>9. ______isolating mechanisms lead to reproductive isolation by preventing the formation of hybrid zygotes. </p><p>10. The hypothesis that suggests changes occur gradually through time, as evidenced by the fossil record, is called ______. </p><p>11. A ______is a separate group of organisms incapable of interbreeding with other such groups. </p><p>12. In the Hardy-Weinberg equation p2 +2pq + q2, describe what each genotype is represented by each member of the equation. </p><p>13. What is the process of natural selection? </p><p>14. Give an example of behavioral isolation. </p><p>15. What does the fossil record tell us? </p><p>16. Give two examples of nonrandom mating. </p>