Organellar DNA
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Other than the DNA available in the main genome, inside the nucleus, in eukaryotes there is a certain amount of DNA outside the genome. Eukaryotic cells contain certain types of organelles which have their own DNA. These organelles are mitochondria and, in plants, plastids (e.g., chloroplasts).
Unlike nuclear DNA, which is present as linear molecules inside the chromosomes, organellar DNA is present as circular DNA molecules of high copy number. Also, because organelles are uniparentally inherited in many organisms, so is their organellar DNA.
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