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?
A. 6 million years
B. 10 million years
C. 30 million years
D. 60 million years

Answer 1

Answer;

D.60 million years

Explanation;

The two species shared a common ancestor 60 million years ago, if the molecules found in these two species differ by a total of six mutations.

Mutation is a sudden, random spontaneous change that occur in the genetic make up of an organism or a cell.

If one mutation occurred after 10 million years;

Then six mutations will need (6 ×10) 60 million years.

Answer 2

Answer:

C. 30 million years

Explanation:

1/10 neutral rate of mutations x 6 base-pair mutations = 60

Divided by two species equals 30

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