In genomic imprinting the ability of a gene to be expressed depends upon the sex of the parent who passed on the gene. In some cases imprinted genes are expressed when the are inherited from the mother.
Genomic imprinting (which is "epigenetic") constitutes heritability that is not coded in DNA. Evolution is prevalent also in viruses, although these are not considered to be organisms. The genetic material in viruses may consist of DNA or RNA.
4.1 Genomic imprinting and related disorders
4.2 Transgenerational epigenetic observations
4.3 Cancer and developmental abnormalities
5 Epigenetics in microorganisms
6 See also
7 Further reading
8 Notes and references
9 External links ...
Non-traditional inheritance: mosaicism, microdeletion syndromes, uniparental disomy, genomic imprinting, trinucleotide repeats, mitochondrial disorders
The events in sexual development and some genetic abnormalities ...
Background materials for teachers discuss a wider range of phenomena that require nontraditional views of inheritance, including RNA editing, genomic imprinting, transposable elements, and uniparental disomy.
A hereditary mental disorder, partially explained by genomic imprinting and the addition of nucleotides to a triplet repeat near the end of an X chromosome.
frameshift mutation ...
Mental problems are more common if the fragile X is inherited from the mother. This is an example of genomic imprinting discussed in the previous chapter. Fragile-X is more common in males because males inherit their X chromosome from their mother.
 See also: DNA, Organ, Trans, Chromosome, Imprinting
  
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