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History of genetics
Learn introductory genetics with Braimy- B.Sc agriculture
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  • Extranuclear inheritance or cytoplasmic inheritance is the transmission of genes that occur outside the nucleus.
  • It is found in most eukaryotes and is commonly known to occur in cytoplasmic organelles such as mitochondria and chloroplasts or from cellular parasites like viruses or bacteria.
  • Extracellular inheritance is a non-Mendelian inheritance wherein a trait was transmitted from the parent to the offspring not nuclear in nature but involving other organellar genetic material.
  • 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.

Extranuclear Inheritance- Cytoplasmic Factors and Types

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