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What is the main assumption behind the idea of a molecular clock quizlet?What is the main assumption behind the idea of a molecular clock? a character that is shared by two or more species because it originated in their most recent common ancestor character.
What assumptions underlie the use of a molecular clock?The assumption underlying the strict molecular clock is that evolutionary rates across lineages are constant. Molecular clock tests have been developed to assess the validity of the rate constancy assumption for DNA and amino acid sequences.
Why is the use of a molecular clock controversial?Molecular clocks in general are much more "erratic" than previously thought, and practically useless to keep accurate evolutionary time, the researchers conclude. They attribute this to the vagaries of natural selection, which may at times constrain specific genetic mutations in certain lineages.
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Which of the following statements are true regarding the use of the molecular clock?
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