Genetic Engineering
Study Questions

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  1. Which of the following are prezygotic isolating mechanisms? (check all that apply)
  1. the inability of sperm to fertilize the egg
  2. the inability to have offspring which grow to adulthood
  3. the inability of an insect to detect pheromones (pheromones are chemicals that insects use to attract a mate)
  4. attraction of a mate to a specific mating call
  1. Speciation: (check all that apply)
  1. involves the development of two or more species from one species due in part to reproductive isolation barriers.
  2. is caused by different changes in different environments.
  3. can result from diversifying selection.
  4. is facilitated by isolation barriers.
  1. Two species of beetles occur in the same area, but one feeds only on thistles, and the other feeds only on plants that grow near thistles. The beetles mate only on the plants that they feed on. They do not interbreed in nature, but they will mate in the laboratory. This would be an example of:
  1. postzygotic isolating mechanism
  2. speciation
  3. prezygotic isolating mechanism
  4. genetic drift
  1. The mechanism behind natural selection is correctly summarized in this phrase: "Adaptation occurs through exposure to environmental selection agents."
TRUE
FALSE
  1. Genetic drift is change in allele frequencies due to natural selective forces.
TRUE
FALSE
  1. The peppered moth is an example of a population adapting to a changing environment.
TRUE
FALSE
  1. Speciation occurs because genetically varied individuals in a population are isolated from the rest of the population and evolve in different ways.
TRUE
FALSE
MATCHING:
(use lower case; incorrect responses will be replaced with a "?".)

8. prezygotic a. random changes

9. postzygotic b. 1 --> 2

10. speciation c. hybrid sterility

11. adaptation d. mating calls

12. genetic drift e. survival trait
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