Mitochondria gene (True statement)a) Paternal transmissionb) Maternal transmissionc) Mendelian inheritanced) Mitochondrial myopathy: (A) c, (B) bd, (C) ab, (D) ac
Answer is B. Mitochondrial DNA is always maternally inherited.
Important mitochondrial diseases are mitochondrial encephalomyopathy with lactic acidosis and stroke-like episodes (MELAS), Leber hereditary optic neuropathy, myoclonic epilepsy with ragged-red fibers, Leigh syndrome, Pearson syndrome, keams-sajre syndrome, chronic progressive external ophthalmoplegia and NARP (neurogenic weakness with ataxia & retinitis pigmentosa).