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PCAT Review Questions - Pharmacy College

Category - Biology

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Which of the following statements about adaptive radiation is false?
  1. Adaptive radiation is a rapid process.
  2. Phenotypes adapt to the environment.
  3. Adaptive radiation often occurs as the result of an organism arising in an environment with an undefined niche.
  4. Adaptive radiation results in the creation of numerous species from a single lineage.
  5. Adaptive radiation is not driven by natural selection.
Explanation
Answer: E, The statement about adaptive radiation that is false is that adaptive radiation is not driven by natural selection. The process occurs as the result of natural selection.

Key Takeaway: Adaptive radiation is a rapid evolutionary process characterized by an increase in the morphological and ecological diversity of a single, rapidly dividing lineage. It often occurs in organisms without a defined niche, as the species may radiate rapidly to take advantage of all of the unoccupied niches. In Lake Victoria, a lake in the African rift valley, over 300 new species radiated from a single lineage over the course of 15,000 years.
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