Molecular clocks are usually calibrated based on
A)guesses about the rates of mutations in a particular gene.
B)observed rates of mutation in a particular gene.
C)the first shared common ancestor for species known from the fossil record.
D)comparing the gene to similar genes in other kingdoms.
E)the date when two species diverged from a common ancestor.

Question

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Molecular clocks are calibrated based on the date when two species diverged from a common ancestor. This allows for estimation of the time elapsed since the divergence of the two species based on the accumulation of mutations in their genomes over time.

Molecular Clocks Are Usually Calibrated Based on