Right answer is (b) False
The best explanation: The Dayhoff Model of Protein Evolution as Used in PAM Matrices is a Markov process. In Analysis of the Dayhoff Model, each amino acid site in a protein can change at any time to any of the other 20 amino acids with probabilities given by the PAM table, and the changes that occur at each site are independent of the amino acids found at other sites in the protein and depend only on the current amino acid at the site.