What do a.m. and p.m. stand for?

molecular clock

the changes in the amino acid sequences of proteins that take place during evolution and speciation, and from which the dates of branchings of taxonomic groups can be deduced. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for molecular clock
  • When dating biological events, molecular geneticists rely on a concept known as the molecular clock.
  • Their closeness was brought home when the researchers constructed a molecular clock.
  • Second, one can use molecular clock methodologies to peg the timing of the separation between two clades.
Contemporary definitions for molecular clock

the rate at which nucleotide (amino acid) substitutions occur in a given DNA (protein) sequence's 21st Century Lexicon
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