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Introduction
Principles of inheritance
Genotypic variation
Other forms of heritable variation
Other sources of heritable variation
Epigenetic effects
Copy number variants
Mobile elements
Quantitative variation and heritability
Novel sources of genetic variation
The practice of plant breeding
Breeding methods
Plant Breeders' rights
New technologies for plant breeding
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Mobile elements

A third source is due to the action of mobile elements ("jumping genes"). These are short pieces of DNA which can (and do) move from one place in the genome to another. When they land in a new position, this can disturb the expression of a gene nearby to the landing site.