Dictionary » E » Extranuclear inheritance

Extranuclear inheritance



A form of non-Mendelian inheritance in which a trait was transmitted from the parent to offspring through nonchromosomal, cytoplasmic means.


There are traits manifested in certain eukaryotes that result from extranuclear inheritance. The mitochondria, for instance, contain genetic material independent of the chromosomes inside the nucleus.

During the union of gametes, the mitochondrial DNA from the maternal parent is imparted to its offspring. Hence, when the mitochondrial DNA is expressed the resulting traits would be extranuclear in nature, and determined largely as maternal effect. Inherited diseases relating to mitochondria is called mitochondrial disease.


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mtDNA vs normal DNA - how to illustrate it in plants

... genome is approximately 16kb pairs. The real meat of mitochondrial inheritance is that cytoplasmic genes do not demonstrate Mendelian patterns ... That is a whole other topic though. On an interesting note, extranuclear inheritance is not thwarted by substituting a genetically different ...

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by ERS
Sun Jul 10, 2005 10:14 pm
Forum: Genetics
Topic: mtDNA vs normal DNA - how to illustrate it in plants
Replies: 3
Views: 4962

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