Evolution:
Change Through Time
Study Questions

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  1. In a population of mosquitos at Utah Lake, the genotypes and number of each are: (aa) 30 million, (Aa) 100 million, and (AA) 30 million. After this population was sprayed with DDT, it was found that the majority of the survivors were homozygous individuals. This is an example of:
  1. directional selection
  2. diversifying selection
  3. stabilizing selection
  1. Which of the following statements are correct about Darwin?
  1. He was the first scientist to develop the concept of natural selection.
  2. He showed that flower color in peas was determined by natural selection.
  3. He proposed that more offspring are produced than can survive.
  4. He published On the Origin of Species in 1859.
  1. Which of the following provides evidence for evolution?
  1. creationism
  2. changes in allele frequencies in a population of plants
  3. a base change due to mutation causing a different amino acid to be produced
  4. a strain of bacteria developing resistance against the antibiotic penicillin
  1. What are the possible consequences of having no genetic variation within a population?
  1. The population can survive forever because it is stable.
  2. A single change in the environment might destroy the entire population.
  3. A disease that affects one member of the population will affect them all.
  1. Which of the following is the ultimate source of genetic variation?
  1. genetic recombination
  2. transposons
  3. mutations
  4. polyploidy
  1. Which of the following is not a biotic selection force?
  1. predation
  2. competition for food
  3. amount of space
  4. parasites
  1. Creationism can be called a science because it can be tested by observable methods.
TRUE
FALSE
  1. Characteristics that are acquired throughout a lifetime based on need can be passed on to offspring.
TRUE
FALSE
  1. Variation naturally exists in a population
TRUE
FALSE
  1. Natural selection works on genotypes, not phenotypes.
TRUE
FALSE
  1. Natural selection does not produce new adaptations; it merely sifts them.
TRUE
FALSE
MATCHING:
(use lower case; incorrect responses will be replaced with a "?".)

12. stabilizing selection a. selects for the extremes

13. directional selection b. selects for the average

14. diversifying selection c. selects for one extreme
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