Question

A molecule that can be used as a molecular clock has a neutral mutation rate of one mutation per 20 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?

60 million years

120 million years

100 million years

30 million years

Answer 1

six mutations means ?

Answer 2

?

Answer 3

Does this mean after mutation an offspring is produced?

Answer 4

i'd go for 120million years