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22340 Pathology

A 3-year-old boy has had progressive developmental delay, ataxia, seizures, and inappropriate laughter since infancy. The child has a normal karyotype of 46, XY, but DNA analysis shows that he has inherited both of his number 15 chromosomes from his father. These findings are most likely to be indicative of which of the following genetic mechanisms?

AGenomic imprinting
BMaternal inheritance pattern
CMutation of mitochondrial DNA
DTrinucleotide repeat expansion
Pathology
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