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Mitochondrial DNA in humans is

  • A.circular and inherited from the mother
  • B.linear and inherited from both parents
  • C.circular and inherited from the father
  • D.linear and inherited from the mother

Answer: A

The circular form is a legacy of the bacterial ancestry, and the egg contributes essentially all of the mitochondria in a zygote. This makes the sequence useful for tracing maternal lineages. Population geneticists use it to follow descent through the female line.

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