BIOL 1202 : Test 1
Document Summary
Chapter 22 (descent with modification: a darwinian view of life) Evolution by natural selection: charles darwin and alfred russell wallace developed the theory independently, darwin- voyage if the beagle, wallace- naturalist in indonesia. Natural selection: the unequal survival and reproduction of organisms due to environmental forces, resulting in the preservations of favorable adaptations, process selects from what is available in the gene pool, new characteristics are not created on demand. Mechanism behind natural selection: variability, heritability, differential reproductive success. Artificial selection: selective breeding of organisms to encourage the occurrence of desirable traits analogous to natural selection, analogous to natural selection, figure 22. 9. Questions: within a few weeks of treatment with the drug 3tc, a patients hiv population consists almost entirely of 3tc resistant viruses. How can this best be explained: answer: a few drug resistant viruses were present at the start of treatment, and natural selection increased the frequency.
