Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
A gene family has been accumulating nucleotide substitutions at a rate of 0.25 substitutions per million years.On average,there have been 80 substitutions between the common ancestor of this gene family and each of the various living forms of this gene.
-How many substitutions are likely to have evolved between any pair of living forms of genes from this gene family?

A) 20
B) 40
C) 80
D) 160
E) 320