Why isn't mitochondrial DNA a unique identifier?
A. Mitochondrial DNA is inherited through the maternal lineage. All offspring inherit their mother's mitochondria and therefore the same mitochondrial DNA. As a result, all family members that share a maternal lineage would have the same mitochondrial DNA. Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line, but cannot be used to identify a specific individual.
B. Mitochondrial DNA is inherited through the maternal lineage. All female offspring inherit their mother's mitochondria and therefore the same mitochondrial DNA. As a result, all female family members that share a maternal lineage would have the same mitochondrial DNA. Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a maternal line, but cannot be used to identify a specific individual.
C. Mitochondrial DNA is inherited through the paternal lineage. All offspring inherit their father's mitochondria and therefore the same mitochondrial DNA. As a result, all family members that share a paternal lineage would have the same mitochondrial DNA. Mitochondrial DNA can therefore be used to confirm or eliminate a person's relationship within a paternal line, but cannot be used to identify a specific individual.
Answer: A
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