But there are also Microsatellites https://en.wikipedia.org/wiki/Microsatellite#Mutation_mechanisms_and_mutation_rates https://en.wikipedia.org/wiki/Microsatell

But there are also Microsatellites https://en.wikipedia.org/wiki/Microsatellite#Mutation_mechanisms_and_mutation_rates https://en.wikipedia.org/wiki/Microsatellite#Mutation_mechan... that are repeated sequences in the DNA. It's difficult to copy the correct number of repetitions, so they have a higher mutation rate. It's like like a controlled localized increased rate of mutation.