A pedigree analysis reveals that a specific genetic disorder is passed exclusively from affected mothers to all of their children, regardless of sex. Affected fathers do not transmit the disorder to any of their offspring. This mode of inheritance is characteristic of mutations in which of the following?

The correct answer to the question "A pedigree analysis reveals that a specific genetic disorder is passed exclusively from affected mothers to all of their children, regardless of sex. Affected fathers do not transmit the disorder to any of their offspring. This mode of inheritance is characteristic of mutations in which of the following?" is Option C: Mitochondrial DNA.

The other options — A) Autosomal dominant genes, B) X-linked recessive genes, D) Y-linked genes — are incorrect for this USMLE Exam Prep question. As explained above: Mitochondrial DNA is inherited exclusively from the mother, as the ovum contributes almost all mitochondria to the zygote. Thus, all offspring of an affected mother inherit the trait, while none of a…