molecular clock


noun

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.

QUIZZES

Can You Remember Your Favorite Words Of The Day From March?
Even if you’re a habitué of Word of the Day, you haven’t seen our March words in these ways! Challenge yourself to our comprehensive quiz!
Question 1 of 15
What does "habitué" mean?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020