2. The place Darwin visited on his trip around the world that had the greatest impact on his thinking was the Canary Islands. Africa. the Hawaiian Islands. x the Galapagos Islands. Brazil.
3. According to Darwin, natural selection is based on the ____ found in populations. acquired characters x variations weakest members noncompetitors similarities
4. Which of the following evolve? x populations genera kingdoms phyla individuals
5. New alleles arise by x mutation. migration. genetic drift. random mating. independent assortment.
6. The maintenance of Hardy-Weinberg equilibrium is encouraged when sexual selection occurs. when mutations occur. in small populations. x when there is no gene flow between different populations. all of these
7. The introduction of a small population onto an island that results in a limited gene pool for a population best describes the Hardy-Weinberg law. genetic drift. the bottleneck effect. x the founder effect. the effect of genetic isolation.
8. The sharp reduction of the gene pool and the numbers of a population through a severe epidemic is an example of artificial selection. genetic isolation. x the bottleneck effect. the founder effect. all of these
9. The fossil record is incomplete because very few organisms were preserved as fossils. organisms tend to decay before becoming a fossil. animals with hard parts are preserved more easily. geological processes may destroy fossils. x all of these
10. Which of the following habitats is most likely to be rich in fossils? eroding hillsides deserts polar ice caps x bed of former shallow sea rocky plateau
11. A species is composed of related organisms. a group of reproductive females. x populations that have the potential to interbreed and produce fertile