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Mitochondrial DNA (mtDNA) is a small, circular DNA molecule found in the mitochondria of cells and is inherited exclusively through the maternal line. Unlike nuclear DNA, which is inherited from both parents and undergoes recombination, mtDNA is transmitted almost unchanged from mother to offspring. This unique mode of inheritance makes mtDNA a powerful tool for studying biological diversity ________ ______ ____ ______ ____ ________ ______ ______.
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