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16 March, 16:49

What is the basis for the use of a molecular clock to determine the absolute time of evolutionary change?

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  1. 16 March, 17:29
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    Nucleotide substitutions in a gene occur at a relatively constant rate.

    A nonsynonymous substitution is a nucleotide mutation that alters the amino acid sequence of a protein. Nonsynonymous substitutions differ from synonymous substitutions, which do not alter amino acid sequences and are (sometimes) silent mutations.
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