Which of the Following Statements About the Use of Molecular

question 53

Multiple Choice

Which of the following statements about the use of molecular clocks in phylogenetic analyses is true?

• A) A given gene usually evolves at the same rate in two different species regardless of differences in generation time of the species.
• B) Because changes in DNA sequences occur very slowly, molecular clocks can be used only to date evolutionary divergences that occurred millions of years ago.
• C) Molecular clocks must be calibrated with independent data, such as the fossil record.
• D) Even in a group of closely related species, different genes have been found to evolve at different rates.
• E) Both c and d

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