MCAT Biology Question 179: Answer and Explanation

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Question: 179

14. Which of the following was NOT a belief of Darwin's?

  • A. Evolution of species occurs gradually and evenly over time.
  • B. There is a struggle for survival among organisms.
  • C. Genetic recombination and mutation are the driving forces of evolution.
  • D. Those individuals with fitter variations will survive and reproduce.

Correct Answer: C

Explanation:

Darwin's main argument was that natural selection is the driving force for evolution. Darwin did not consider the role of genetic mutation and recombination, which were unknown at the time. These aspects were added to Darwin's theory as part of the modern synthesis model, which did not occur until significantly after Darwin's time.

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