Bio1151b Chapter 22 Descent with Modification
  1. Charles Darwin explained the diversity of life by            of              . through          with               from a common ancestor.
  2. His ideas can be summarized in        inferences based on       observations.
    • Observation #1:                 of offspring.
    • Observation #2: Populations tend to remain         in size over time.
    • Observation #3: Resources are limited.
      • Inference #1 (           for existence): There is a struggle for            among individuals of a population.
    • Observation #4: Members of a population exhibit            in their characteristics.
    • Observation #5: Much of this variation is            .
      • Inference #2 (          selection): Individuals whose inherited traits give them a high probability of surviving and              are likely to leave more offspring than others.
      • Inference #3 (             ): A population will gradually accumulate favorable characteristics over generations and become more          to its environment.
  3. Humans have modified other species over generations by            and breeding individuals that possess desired traits. Darwin called this             selection.
  4. Drug resistance in bacteria and viruses such as HIV are probably due to            and            for individual organisms that possess the resistance.
  5.             anatomical structures, such as the            among mammals, provide evidence of common ancestry with modifications.
  6. Comparative             reveals anatomical             not visible in adults.
  7. In               , related species tend to be found in the same area; unrelated species that occupy similar ecological niches may look similar by             evolution.
  8. Darwin's theory of evolution predicts               forms during the evolution of species, and this is supported by         records.
  9.            homologies provide the latest support for Darwin's theory of evolution.