Why do chloroplasts and mitochondria contain so many copies of their genome?

Bioessays 6 (6):279-282 (1987)
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Abstract

The very high genome copy number in cytoplasmic organelles is a puzzling fact in cell biology. It is proposed here that high copy number reflects an increased need for organellar ribosomes that can only be satisfied by the increased ribosomal RNA gene number that results from genome multiplication.

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10.1002/bies.950060608

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