Which of the following experimental observations suggest that adisease has a genetic basis?A. The frequency of the disease is less likely in relatives that liveapart compared with relatives that live together.B. The frequency of the disease is unusually high in a small groupof genetically related individuals who live in southern Spain.C. The disease symptoms usually begin around the age of 40.D. It is more likely that both monozygotic twins will be affectedby the disease than will dizygotic twins.

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.