What is the significance of the genetic difference between slow-moving marker mutations and fast-moving marker mutations?
The difference is how often we expect this type of mutation to take place. Since a fast-moving marker is more likely to mutate, we can expect it to have happened more recently. Slow-moving markers are much less likely to mutate, so if it does mutate we have to allow more generations for it to have happened. Of course, any mutation can take place in any generation, but some are more likely than others. If the difference between person A and person B is a mutation on a fast moving marker, and the difference between person C and person D is a mutation on a slow moving marker, then our predictions of when the common ancestor would have lived would indicate a more recent common ancestor for A and B than for C and D.
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