A Scientist Uses Polymerase Chain Reaction (PCR)to Compare the Sequence

Multiple Choice

A scientist uses polymerase chain reaction (PCR) to compare the sequence of a disease gene and a healthy gene.The scientist finds that these two genes are identical except for one G in place of a T at position 256 in the gene.This type of mutation is a(n)

A) deletion.
B) insertion.
C) silent mutation.
D) substitution mutation.