Suppose That Two Species of Fish (Species a and B)

Multiple Choice

Suppose that two species of fish (species A and B) differ by ten substitutions in their globin genes, and that these fish diverged 5 million years ago (based on biogeographical evidence) .A third species (species C) differs from species A by 40 substitutions.Assuming the molecular clock has been operating, species A and C must have split from each other _______ million years ago.

A) 5
B) 10
C) 20
D) 40
E) More information is required to answer this question.