DNA Mutations. Chapter 12.4. Mutation. Mutation : Any change in a gene is a mutation. Substances that cause a mutation are called mutagens. Mutations can also happen spontaneously. Point Mutation. A change in one nucleotide
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1.Translocations - When part of one chromosome breaks off and is added to a different chromosome.
2. Inversion – When part of a chromosome breaks out and is reinserted backwards.
3. Insertion When part of a chromatid breaks off and attaches to its sister chromatid. The result is a duplication of genes on the same chromosome.
When part of a chromosome is left out.