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)

Question

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A substitution mutation is when one base pair is replaced by another one in the DNA sequence. In this case, the G replaced a T at position 256, which is an example of a substitution mutation. A deletion mutation would involve the loss of one or more nucleotides, while an insertion mutation would involve the addition of one or more nucleotides. A silent mutation is when a change in the DNA sequence does not result in a change in the amino acid sequence of the protein, which is not the case in this scenario. Therefore, the best choice is D, substitution mutation.

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