Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions:
In a hypothetical experiment, researchers split a bacterial colony in two, allowing each of the new colonies to evolve separately. They then sequenced a gene from colony 1 and colony 2.
-In the common ancestor, the nucleotide at site 167 is T. In colony 1, it changes to C; in colony 2, it remains T. This is an example of a _______ substitution.

A) single
B) coincident
C) parallel
D) back
E) multiple