A chemical or physical change that alters the sequence of bases in DNA molecules is called ............

Explanation

To solve the question, we need to identify the term that describes a change in the sequence of bases in DNA molecules, whether it is due to a chemical or physical change.

### Step-by-Step Solution:

1. **Understanding DNA Structure**:
- DNA (Deoxyribonucleic Acid) is composed of sequences of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base.
- The order of these nitrogenous bases (adenine, thymine, cytosine, and guanine) encodes genetic information.

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