Which of the following is NOT the result of a mutation in the DNA sequence of an organism?

Question 4 options:

1)

One nucleotide from a gene is changed from a T to and A but the amino acid that is produced at that position is not affected by that change.

2)

DNA is copied during mitosis and when the two resulting copies of DNA are compared they are found to contain the same order of nucleotides.

3)

Several bases of the DNA sequence of a gene are deleted causing the gene not to produce a protein.

4)

A DNA sequence has a change of one base from a T to an A which causes a different amino acid to be produced.

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