How Does a Molecular Clock Measure Time

question 51

Multiple Choice

How does a molecular clock measure time?

• A)by observing that some genes and other regions of genomes appear to evolve at different rates
• B)by detecting gene irregularities that result from natural selection
• C)by counting the number of nucleotide substitutions over a fixed period of time
• D)by using few gene mutations to calibrate the clock

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