Genetics/Course/Mutations
Mutations are changes in DNA that affect the order of nitrogen bases.
Mutagens are factors in the environment that causes mutations.
Changes in chromosome structure
[edit | edit source]Chromosome mutations are changes in genetic material that involve entire chromosomes or pieces of them.
- Deletion occurs when one or more genes may be lost entirely during division if crossover during meiosis is unequal.
- Duplication results when the unequal crossover causes a duplication in some of the genes.
- Translocation occurs when a piece of chromosome attaches to a chromosome in a different pair.
- Inversion occurs when a piece of a chromosome breaks free and reattaches itself in a reverse order.