What is often a problem when calibrating a molecular clock? A. There are frequently not enough negative mutations to accurately calibrate the clocks. B. There are many different clocks, each of which "ticks" at a different rate. C. The clocks use mutations that are difficult to identify and track. D. The frequency of crossing over is used to calibrate the clocks.
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How does the molecular clock work? A. It analyzes the brain functionality of two different species. B. It examines and compares the physical characteristics of two different species. C. It illustrates relationships between two different species. D. It compares the number of mutations that exist in the DNA of two different species.
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Which does not affect the rate of mutation in a molecular clock? A. type of mutation B. location of gene in genome C. the protein affected D. the time of divergence
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