Question

A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 10 million years. How many years ago did two species share a common ancestor if the molecules found in these two species differ by a total of six mutations?

6 million years
30 million years
10 million years
60 million years

Answer 1

Out of the choices given here, it was 30 million years ago the two species differed by a total of six mutations.