* * *the inheritance of traits controlled by genes on the DNA of mitochondria in the ooplasm; the genes are thus inherited entirely from the mother (maternal inheritance). Inheritance is nonmendelian, since mitochondria are randomly distributed to the daughter cells at meiosis or mitosis. Mutations of the mitochondrial DNA cause a number of maternally inherited disorders; phenotypic expression of these disorders is variable and depends on the proportions of normal and mutant DNA.
Medical dictionary. 2011.
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