<unk>  was first observed by the effect it had on the color of corn kernels in maize plants In epigenetics, a<unk>  is an interaction between two alleles at a single locus, whereby one allele induces a heritable change in the other allele. The change may be in the pattern of DNA methylation or histone modifications. The allele inducing the change is said to be paramutagenic, while the allele that has been epigenetically altered is termed paramutable. A paramutable allele may have altered levels of gene expression, which may continue in offspring which inherit that allele, even though the paramutagenic allele may no longer be present. Through proper breeding,<unk>  can result in siblings that have the same genetic sequence, but with drastically different phenotypes. Though studied primarily in maize,<unk>  has been described in a number of other systems, including animal systems like Drosophila melanogaster and mice. Despite its broad distribution, examples of this phenomenon are scarce and its mechanism is not fully understood.
Paramutation
Expressivity 
Caudal duplication
Pseudodominance
Bromism
Uniparental disomy
Variegation 
Isodisomy